洞窟を這い刺すもの
クリーチャー — 昆虫・ホラー
接死
落魄４ ― 洞窟を這い刺すものが攻撃するたび、あなたの墓地に４枚以上のパーマネント・カードがある場合、カード１枚を引き、１点のライフを失う。
マイコイドすら居着かぬ洞窟には、それ以上の恐怖が潜んでいる。
イラスト：
The Lost Caverns of Ixalan#124アンコモン日本語適正
裁定
Cards with the ability word "descend N" have abilities that care if you have at least N permanent cards in your graveyard.
Some descend triggered abilities include intervening "if" clauses (i.e. "if you have [four or eight] permanent cards in your graveyard" in the middle of the ability). Each of these abilities checks your graveyard at the moment it would trigger to see if it does. If you don't have the required number of permanent cards in your graveyard at that time, the ability doesn't trigger at all. If it does trigger, it will check again as it tries to resolve. If you don't have the required number of permanent cards in your graveyard at that time, the ability won't resolve and none of its effects will happen.