恐怖の潮流
ソーサリー
底なしの落魄 ― ターン終了時まで、すべてのクリーチャーは－Ｘ/－Ｘの修整を受ける。Ｘは、あなたの墓地にあるパーマネント・カードの枚数に等しい。
呑まれたものは在りし日の自分をおぞましく模した姿で蘇り、汚れた水を吐き散らしながら泣き叫ぶ。
Illustrated by
The Lost Caverns of Ixalan#372RareJapaneseLegality
Rulings
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.
The value of X is checked only once, as Terror Tide resolves.
Cards with the ability word "fathomless descent" have abilities that care how many permanent cards are in your graveyard.