Erratic Cyclops

Ciclope Imprevedibile (Erratic Cyclops) (it)

Creature - Cyclops Shaman | Power/Toughness: 0 / 8 (CMC 4)
Trample
Whenever you cast an instant or sorcery spell, Erratic Cyclops gets +X/+0 until end of turn, where X is that spell's mana value.