Supporting Psyker

Dark Veil—{x}{x},{t}: Roll 2d6, if the total is 7 or greater X target creatures you control gain Hex-
-proof until end of turn. If the total is 2, exile Sanctioned Psyker and take X damage.
When Supporting Psyker is Exiled by Dark Veil
Put a 8/8 black Warp Demon token onto the battlefield with shadow, deathtouch, and menace.
Warp Demon must attack each turn if able.
When Warp Demon attacks, all players sacrifice
a creature with the highest converted mana cost.