Hearthborn Battler 

Creature — Lizard Warlock
Haste
Whenever a player casts their second spell each turn, this creature deals 2 damage to target opponent.
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Cards that do something similar expected a card that isn't here?
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Iron-Fist Pulverizer 86%
$0.10#19338
"Whenever you cast your second spell each turn, this creature deals 2 damage to target opponent. Scry 1."