Bloodsky Berserker 

Creature — Human Berserker
Whenever you cast your second spell each turn, put two +1/+1 counters on this creature. It gains menace until end of turn. (It can't be blocked except by two or more creatures.)
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Cards that do something similar expected a card that isn't here?
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Witch-Maw Nephilim 82%
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"Whenever you cast a spell, you may put two +1/+1 counters on this creature."
Monk of the Open Hand 81%
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"Whenever you cast your second spell each turn, put a +1/+1 counter on this creature."
Thunder Drake 81%
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"Whenever you cast your second spell each turn, put a +1/+1 counter on this creature."
Illvoi Operative 81%
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"Whenever you cast your second spell each turn, put a +1/+1 counter on this creature."
Poised Practitioner 80%
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"Whenever you cast your second spell each turn, put a +1/+1 counter on this creature. Scry 1."