Ashiok, Born in Dreams

Deathtouch
{u/b}{u/b}{t}: Each opponent discards a card. If any
creature is discarded this way, create a Horror
token copy of it with "If this permanent becomes
a target of a spell or ability, sacrifice it."
When Ashiok, Born in Dreams becomes a target
of a spell or ability, exile it, then return it transformed into Ashiok, the Nightmare under
its owner's control.