Karn, Silver Golem

(T: Add G.)

Flying When you cast a creature spell, sacrifice this creature.

(T: Add B.)

(T: Add U.)

Counter target spell. Untap up to four lands.

(T: Add R.)

Echo G (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its echo cost.)

(T: Add W.)