Krang & Shredder
Whenever Krang & Shredder enter or attack, each opponent exiles cards from the top of their library until they exile a nonland card.
Disappear — At the beginning of your end step, if a permanent left the battlefield under your control this turn, you may cast a card exiled with Krang & Shredder without paying its mana cost.
Illustrated by Daniel Elson
This printing
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If a spell has
in its mana cost, you must choose 0 as the value of X when casting it without paying its mana cost.Some disappear abilities, such as those of the above cards, are triggered abilities with intervening if clauses. If a permanent hasn't left the battlefield under your control that turn by the time the disappear ability would trigger, it won't trigger at all.
If you cast a spell "without paying its mana cost," you can't choose to cast it for any alternative costs. You can, however, pay additional costs. If the spell has any mandatory additional costs, those must be paid to cast the spell.
You cast the card while Krang & Shredder's last ability is resolving and still on the stack. You can't wait to play it later in the turn. Timing restrictions based on its types are ignored.
