The Doomslayer

Equip {3}
Equipped creature get`s +4/+4 and gains indestructible and trample. If equipped creature destroys a creature an opponent controls, it get`s
+X/+X, where X is that creatures converted
mana cost.
If equipped creatures power is higher than 20,
equip another creature you control. If you can`t, sacrifice The Doomslayer.