2022-02-18 : If a card in a player's library has {X} in its mana cost, X is 0.

2022-02-18 : Players can only respond once this spell has been cast and all its costs have been paid. No one can try to interfere with the permanent you sacrificed to prevent you from casting this spell.

2022-02-18 : You must sacrifice exactly one artifact or creature to cast this spell; you can't cast it without sacrificing an artifact or creature, and you can't sacrifice additional artifacts or creatures.