Spiritual Asylum {2}{W}{W}
Enchantment
Creatures and lands you control have shroud. (They can't be the targets of spells or abilities.)
When a creature you control attacks, sacrifice this enchantment.
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Cards that do something similar expected a card that isn't here?
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The Meep 81%
$29.88#19203
"Whenever this card attacks, you may sacrifice another creature. If you do, creatures you control have base power and toughness X/X until end of turn, where X is the sacrificed creature's mana value."