Adaptive Autocrustacean

Reach
At the beginning of each end step, put a number
of +1/+1 counters on Adaptive Autocrustacean
equal to the amount of damage dealt to it this
turn.
{u}, Remove three +1/+1 counters from Adaptive
Autocrustacean: It can't be blocked this turn.
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Every time it is broken, the construct rebuilds itself
stronger, deadlier, unstoppable.