Spinal Embrace {3}{U}{U}{B}
Instant
Cast this spell only during combat.
Untap target creature you don't control and gain control of it. It gains haste until end of turn. At the beginning of the next end step, sacrifice it. If you do, you gain life equal to its toughness.
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Cards that do something similar expected a card that isn't here?
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+1 more matching line
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"Cast this spell only during the declare attackers step and only if you've been attacked this step."