ChaosWalker the Emulator

X: X is the target ability's cost. ChaosWalker copies any target plus ability of a planeswalker on the battlefield or in/on the Chaos Discard pile
X: ChaosWalker copies any target negative ability of a planeswalker on the battlefield or in/on the Chaos Discard pile.
-20: Target a negative ability of a planeswalker on the battlefield. Create an enchantment that says "During your upkeep, copy the Targeted ability."