Vizkopa Profiteer

Lifelink
Extort (Whenever you cast a spell, you may pay {w/b}. If you do, each opponent loses 1 life and you gain that much life.)
Whenever you extort for the first time each turn, put a +1/+1 counter on Vizkopa Profiteer.
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He'll bleed you dry, one payment at a time.