Xarktyyhrusz, King of the Cult

Flying, Indestructible, Trample, Hivemind 4
Xarktyyrusz can't enter the battlefield unless you control three or more cultleaders.
Whenever Xarktyyrusz, King of the Cult
deals combat damage to a player,
gain control of target creature that player
controls, until your next turn.
That creature gains Hivemind and is a cultist in addition to its other types.
Whenever a creature of the creaturetype
cultleader dies, Xarktyyrusz looses
Indestructible until your next turn.