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Casting the card causes it to leave exile. You can’t cast it multiple times.

In a multiplayer game, if a player leaves the game, all cards that player owns leave as well. If you leave the game, any spells or permanents you control from Mindleecher are exiled, and any cards remaining in exile remain face down indefinitely. No player may look at them.

Mindleecher doesn’t change when you can cast the exiled cards. For example, if you exile a creature card without flash, you can cast it only during your main phase when the stack is empty.

You can play lands this way only if you have remaining land plays available for the turn.

You may look at and play those cards even if Mindleecher leaves the battlefield. If another player gains control of Mindleecher, that player can’t look at or play the cards, and you still can.

You pay the costs for the exiled cards if you cast them. You may pay alternative costs such as mutate rather than a card’s mana cost.