Ashiok, Thought Censor

{1}{u}{b}: Ashiok, Thought Censor can't
be blocked this turn.
Whenever Ashiok, Thought Censor deals
combat damage to a player, they exile a card.
from their hand .
Whenever a player has no cards in their hand,
Exile Ashiok, Thought Censor, then return
him to the battlefield transformed into Ashiok,
Mind Smoker under his owner's control.
"A Memory mage, emptiness at the Dynasty'
fall drove him to Arkhos to forget all."