Karkon, Copper Rogue

+2: Draw 2 cards, then discard a card. Target creature gets -X/-X until end of turn, where X is the converted mana cost of the discarded card
-3: Each planeswalker you control gains a loyalty counter. Target creature gets +X/+X, where X is the number of planeswalkers you control
-5: Discard your hand. Target creature gets +X/+X and gains trample until end of turn, where X is the combined mana cost of all discarded cards