Kayn, the Shadow Assasin

First Strike, Lifelink
The Darkin Scythe - If your devotion to blue is {10}, then you may flip Kayn, the Shadow Assasin to become the Shadow Assasin. If your devotion to red is {10}, then you may flip Kayn, the Shadow Assasin to become Rhaast. Each time Kayn, the Shadow Assasin attacks reduces the needed devotion to flip.