You gain life equal to the damage dealt to you this turn. Simulacrum deals damage to target creature you control equal to the damage dealt to you this turn.
All damage done to you so far this turn is instead retroactively applied to one of your creatures in play. If this damage kills the creature it can be regenerated; even if there's more than enough damage to kill the creature, you don't suffer any of it. Further damage this turn is treated normally.
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