Busai, Rotmaxxer

Haste, tremple
Busai, Rotmaxxer enters the battlefield with 3 +1/+1 counters
Embrace the Rot - When Busai, Rotmaxxer enters the battlefield, proliferate twice.
At your end step, Busai, Rotmaxxer loses a
+1/+1 counter unless you pay {w}{g}.