Xorug, Calamity of Anomalies

Whenever you cast a green spell, target creature gets +X/+X, where X is the spell's converted mana cost.
Whenever you cast a red spell, target creature gets +X/+0, where X is the spell's converted mana cost, and trample.
Whenever you cast a blue spell, target creature gets +0/+X, where X is the spell's converted mana cost, and Flying.
Whenever a creature you control becomes the target of a spell you control, exile it at the beginning of your end step.