Finality counter

Finality counters are a type of deciduous counter introduced in The Lost Caverns of Ixalan. They were designed to minimize memory issues for cards that return something from the graveyard with "if it would die, it's exiled instead" rules. 
==Description==
If a permanent with a finality counter on it would die, it is exiled instead. This is a replacement effect. The use of counters makes for better memory tracking, as permanents can be on the battlefield for long periods before their exiling is relevant. Having multiple finality counters on a permanent produces no additional effects.
This effect is usually used for creatures that have been returned from the graveyard to the battlefield at a reduced rate. Similar text was first seen as far back as ; later cards like <c>Isareth, the Awakener</c> or <c>From the Catacombs</c> sometimes used corpse counters to mark affected creatures. Unlike corpse counters, however, where the counter is merely a reminder and the ability remains regardless of the counter's presence, the rules for finality counters are included as part of the counter itself. Thus, if a finality counter is removed, upon destruction the creature returns to the graveyard as normal.
All colors have access to finality counters. Colors that bring things back from the graveyard are most likely to use it, with red, king of temporary effects, probably number one. In practice, however, black and its styles of reanimation has been first by a wide margin, followed by green, with red having only one representative of a {U}{B}{R} card.
==Rules==
122.1h defines how finality counters work:
==Rulings==
*Finality counters work on any permanent, not only creatures. If a permanent with a finality counter on it would go to a graveyard from the battlefield, exile it instead.
*Finality counters don't stop permanents from going to zones other than the graveyard from the battlefield. For example, if a permanent with a finality counter on it would be put into its owner's hand from the battlefield, it does so normally.
*Finality counters aren't keyword counters, and a finality counter doesn't give any abilities to the permanent it's on. If that permanent loses its abilities and then goes to a graveyard, it will still be exiled instead.
*Multiple finality counters on a single permanent are redundant.
==Trivia==
*In Magic Online, the counter is colored blue as its considered a neutral effect.
==References==