Acorn

*For the counter of the same name, see Acorn counter.*

**Acorn** cards, which heavily overlap with discontinued **silver-bordered** cards, are *Magic: The Gathering* cards that are not tournament-legal and are not covered by the comprehensive rules.

## History

Silver-bordered cards were introduced in 1998 for *Unglued*, the first *Magic* supplemental set and the first "joke set" and became tradition for the following so-called Un-sets. Certain promos like the Holiday cards, the 2017 HASCON promos, and *Ponies: The Galloping* also used a silver border.

According to Mark Rosewater, the audience reaction to the silver border was somewhat of a problem for R&D. It most often didn’t get treated as “this is a different subset of *Magic*”, but rather as “this isn’t a real *Magic* card”.

Rosewater later explained that when silver border was originally dubbed "not for tournament play," that meant not for Vintage, Legacy, or Standard, but for every other format, especially the casual ones. Over the years, silver border slowly shifted to end up meaning "not for any official format, casual or not," which contradicted what it was originally intended to do. Rosewater realized that many cards in the set would be perfectly fine to be played in black border Eternal sets. R&D then looked another way to express "silver border-ness" that didn't require a silver border and turned to holofoil security stamps.

Starting with the black-bordered *Unfinity* set in 2022 an acorn security stamp means exactly what a silver border used to. This is a card not meant for tournament play and should only be used in casual formats where all the players agree to its inclusion. These have been dubbed these **"acorn" cards**. All acorn cards, of all rarities, have an acorn holofoil stamp. If a card has an oval security stamp (or no security stamp at lower rarities), it's legal in eternal formats (which includes Commander, Legacy, and Vintage). These have been dubbed **"eternal" cards**. This security stamp technology allows R&D to let the two different types of cards commingle in the same set. On common and uncommons the acorn stamp is printed on the card rather than embossed.

With the change to acorn cards, some earlier silver-bordered cards may now be reprinted in black border. Most cards referencing "silver-bordered" (with the exception of Border Guardian) received errata to include Un-cards that don't have a silver border. Player prejudice against silver borders was definitely a factor in the change to black borders.

Despite this, acorn and silver border cards remain officially illegal in common casual variants such as Commander and Oathbreaker, and see only fringe "Rule Zero" play alongside the likes of Holiday cards, Mystery Booster Playtest cards, and Unknown event playtest cards.

Mark Rosewater later concluded that the switch to acorn didn’t go over great and that players would have been happier with a silver border. To further differentiate the acorn cards in *Unfinity* from the eternal-legal cards, Wizards of the Coast quietly introduced a new set symbol and created a new set code for just the acorn cards — UNA. Eternal cards retained their preexisting atom expansion symbol and set code (UNF). As these changes were made post-release, they only appear on Gatherer and the set's Product Archive page, not on the cards themselves.

### Categories

Acorn cards fall into the following categories:

* Cards that don't work within the official rules
* An element of "cards matter" that normal rules don't reference (flavor text, as an example)
* Cards that require interacting with people outside the game
* Cards that require a physical or vocal component
* Cards that reference a state external to the game (are they able to see something from their seat, for instance)
* Cards with some effects that just don't feel right in normal games

## Un-sets

**Un-sets** are light-hearted supplemental sets intended for fun casual play. These sets seek to break the tradition of other *Magic* sets, drawing on successful mechanical strengths and pushing them to the extreme — often using an outrageously humorous angle. Their common naming pattern gave rise to their slang collective name "un-sets", although they're also referred to as "silver-bordered sets", "humorous sets", etc.

#### Sets

The first four sets used silver borders.

* *Unglued* — 94 card booster set
* *Unhinged* — 141 card booster set
* *Unstable* — "216-ish" card booster set, plus 45 Contraptions
	+ First un-set designed for standalone limited play
* *Unsanctioned* — 96 card set of primarily reprints (16 new cards), bundled as five ready-to-play half decks

Subsequent un-sets use black borders, with many of the cards marked as acorn cards and the rest legal for eternal play.

* *Unfinity* — 244 card booster set, plus 50 Attractions and 48 Sticker sheets
	+ Acorn: 97 cards, plus 28 Attractions

#### Promotional sets

Several promotional card series and mini-sets are designed with the same fun aesthetic as un-sets:

* Holiday cards - One holiday card printed annually since 2006
	+ Switched from using silver borders to using black borders with an acorn stamp in 2022
* HASCON promos - 3 silver-bordered cards
* *Ponies: The Galloping* — 3 silver-bordered cards
* *Ponies: The Galloping 2* — 4 silver-bordered cards in a Secret Lair drop.

## Un-games

Any card that previously referred to a "silver-bordered game" now refers to an "Un-game." It is any game in which at least one player is playing acorn cards or older silver-bordered cards from Un-sets or things like holiday promos.

## Mechanics

*Main article: List of Acorn mechanics*
They feature mechanics that would be impossible to print in a normal expansion.

## Rules

From the glossary of the *Comprehensive Rules* (November 17, 2023—*The Lost Caverns of Ixalan*)

Silver-Bordered
Cards in certain sets and certain promotional cards are printed with a silver border. Silver-bordered cards are intended for casual play and may have features and text that aren’t covered by these rules.
From the *Comprehensive Rules* (November 17, 2023—*The Lost Caverns of Ixalan*)

* **100.7.** Certain cards are intended for casual play and may have features and text that aren’t covered by these rules. These include Mystery Booster playtest cards, promotional cards and cards in “Un-sets” that were printed with a silver border, and cards in the Unfinity™ expansion that have an acorn symbol at the bottom of the card.

## Tokens

Tokens created by silver-bordered and acorn cards.

## References

1. ↑ ***a*** ***b*** ***c*** Matt Tabak (September 20, 2022). "*Unfinity* Mechanics". *magicthegathering.com*. Wizards of the Coast.
2. ↑ Mark Rosewater (February 27, 2021). "Why did yall feel it was necessary to pollute the identity of the core game rather than just spin off a "Universes Beyond" format that was Legacy + UB cards?". *Blogatog*. Tumblr.
3. ↑ ***a*** ***b*** Mark Rosewater (November 29, 2021). "To Unfinity and Beyond". *magicthegathering.com*. Wizards of the Coast.
4. ↑ Mark Rosewater (November 30, 2021). "Commons and uncommons can have the acorn stamp, right?". *Blogatog*. Tumblr.
5. ↑ Mark Rosewater (November 29, 2021). "With unfinity creating legal black border cards...". *Blogatog*. Tumblr.
6. ↑ Mark Rosewater (November 29, 2021). "Will cards like underdome that reference silver...". *Blogatog*. Tumblr.
7. ↑ Mark Rosewater (November 29, 2021). "For border guardian or any other cards that care...". *Blogatog*. Tumblr.
8. ↑ Jess Dunks (October 18, 2022). "*Unfinity* Oracle Changes". *magicthegathering.com*. Wizards of the Coast.
9. ↑ Mark Rosewater (June 13, 2022). "Was player prejudice against silver borders a factor in making Unfinity black-bordered?". *Blogatog*. Tumblr.
10. ↑ Mark Rosewater (August 26, 2023). "How was the switch from 'silver-border' to 'Acorn' received?". *Blogatog*. Tumblr.
11. ↑ Example of UNA in Gatherer on the card A Real Handful.
12. ↑ Mark Rosewater (July 20, 2009). "The Silver Lining". *magicthegathering.com*. Wizards of the Coast.