Keyword counter

A Keyword counter is a counter that gives a keyword ability to a permanent they're on. The game mechanic was featured in Ikoria: Lair of Behemoths.
==Description==
A permanent with a keyword counter on it gains that keyword. Use the counter's timestamp to determine how this interacts with continuous effects. The timestamp of a counter is the most recent time that any counter was put onto that permanent.
For this group of counters, having more than one of the same counter provides no additional benefit. Note that if these counters end up on a noncreature permanent, it won't necessarily apply immediately, but it will if the permanent becomes a creature. (The exceptions here are exalted, hexproof, indestructible, deathtouch, and lifelink, which work even if they end up on a noncreature permanent. Deathtouch and lifelink only matter if that noncreature permanent can deal damage somehow.)
During its introduction in Ikoria: Lair of Behemoths, several spells rewarded creatures with particular keywords (keyword "lords"), as well as multiple creatures and spells that granted the choice of several keywords.
===History===
The Chimeras from Visions were the first cards to (kind of) use keyword counters. If R&D remade them today, they would use keyword counters.
Keyword counters were introduced on a test card in the Mystery Booster set (<c>Recycla-bird</c> with flying counters). 
Ikoria: Lair of Behemoths and Commander 2020 widely expanded on this with ten more keyword counters. Double strike and indestructible counters only appear on cards in the Ikoria Commander set, and not in the main set. 
With the Kaldheim cards <c>Ascendant Spirit</c> and <c>Ascent of the Worthy</c>, which both featured Flying Counters as a mechanic, and <c>Tyrite Sanctum</c> which featured an Indestructible Counter as a mechanic, Keyword Counters slowly moved to deciduous status. By the time of Kamigawa: Neon Dynasty, deciduous status was achieved.
Initially, keyword counters only used the evergreen keyword lists. <c>The Lux Foundation Library</c> introduced shadow counters followed quickly by <c>Minas Morgul, Dark Fortress</c> in the The Lord of the Rings: Tales of Middle-earth holiday release. Modern Horizons 3 brought the Exalted counter on <c>Emissary of Soulfire</c>.
Due to the limited functionality of a haste counter, it took until <c>Indominus Rex, Alpha</c> to print it, as giving it a haste counter would draw an extra card.
===Types of keyword counters===
*Deathtouch counter
*Double strike counter
*Exalted counter
*First strike counter
*Flying counter
*Haste counter
*Hexproof counter
*Indestructible counter
*Lifelink counter
*Menace counter
*Reach counter
*Shadow counter
*Trample counter
*Vigilance counter
==Rules==
==Rulings==
*A permanent with a keyword counter on it has that keyword.
*For determining the interaction of continuous effects, the timestamp of a keyword counter on an object is the most recent time that any counter was put on that object. Removing a keyword counter doesn't change the timestamp of any remaining counters.
*Among the keywords that a keyword counter can grant, multiple instances of any one of these keywords are redundant.
*Some Ikoria packs include a punch-out card with counters that appear in the set. These aren't required for play. As with other counters, players may use any mutually agreeable method to represent the counters.
==Trivia==
*In Magic Online, keyword counters are colored purple rather than the green used for counters with positive effects.
==References==