Shadow, the Ultimate Lifeform

Haste, Menace, Vigilance, First Strike

Chaos Control — Whenever Shadow, the Ultimate Lifeform attacks, tap X target permanents defending player controls. They Don't untap during controller's next untap step, where X is the number of Chaos Emeralds you control.

Chaos Energy — Shadow, the Ultimate Lifeform gets +X/+X, where X is the number of Chaos Emeralds you control.

Partner