Sunbird’s Invocation

#165p - Ixalan Promos - [PXLN]
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Whenever you cast a spell from your hand, reveal the top X cards of your library, where X is that spell’s mana value. You may cast a spell with mana value X or less from among cards revealed this way without paying its mana cost. Put the rest on the bottom of your library in a random order.

PXLN · EN Christine Choi