Delvefall
Primordial Mist

Primordial Mist {4}{U}

Enchantment

At the beginning of your end step, you may manifest the top card of your library. (Put it onto the battlefield face down as a 2/2 creature. Turn it face up any time for its mana cost if it's a creature card.)
Exile a face-down permanent you control face up: You may play that card this turn. (You still pay its costs. Timing rules still apply.)

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Cards that do something similar expected a card that isn't here?

Whisperwood Elemental
Whisperwood Elemental 96%
$0.24#5532
"At the beginning of your end step, manifest the top card of your library."
Baneful Omen
Baneful Omen 87%
$1.82#9770
"At the beginning of your end step, you may reveal the top card of your library. If you do, each opponent loses life equal to that card's mana value."
Aid from the Cowl
Aid from the Cowl 80%
$0.33#10682
"At the beginning of your end step, if a permanent left the battlefield under your control this turn, reveal the top card of your library. If it's a permanent card, you may put it onto the battlefield. Otherwise, you may put it on the bottom of your library."