風冠の者、ケストラル

飛行
あなたがコントロールしている１体以上の鳥がプレイヤー１人に戦闘ダメージを与えるたび、以下から１つを選ぶ。
・あなたの手札かあなたの墓地にある鳥・クリーチャー・カード１枚を最終カウンター１個が置かれた状態で戦場に出してもよい。
・あなたがコントロールしている各鳥の上にそれぞれ、＋１/＋１カウンター１個を置く。
・カード１枚を引く。

Kastral, the Windcrested

Flying
Whenever one or more Birds you control deal combat damage to a player, choose one —
• You may put a Bird creature card from your hand or graveyard onto the battlefield with a finality counter on it.
• Put a +1/+1 counter on each Bird you control.
• Draw a card.

Bloomburrow

Bloomburrow Promos

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 would go to a graveyard, it will still be exiled 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 work on any permanent, not only creatures. If a permanent with a finality counter on it would be put into a graveyard from the battlefield, exile it instead.

Multiple finality counters on a single permanent are redundant.