Dr Mundo, Madman of Zaun

Rampage 2
Exploit
As an additional cost to cast this spell, sacrifice a creature.
When Dr Mundo, Madman of Zaun exploit a creature, grant it +0/+2 and Haste.
Dr Mundo, Madman of Zaun cannot block.
At the beginning of your upkeep step, roll 1D20.
If the result is even, Dr Mundo, Madman of
Zaun attacks. If it is odd, tap it