Intellect Devourer

Devour Intellect — When this creature enters, each opponent exiles a card from their hand until this creature leaves the battlefield.
Body Thief — You may play lands and cast spells from among cards exiled with this creature. If you cast a spell this way, you may spend mana as though it were mana of any color to cast it.

Alchemy Horizons: Baldur's Gate

Battle for Baldur's Gate Promos

Commander Legends: Battle for Baldur's Gate

Devour Intellect — When Intellect Devourer enters the battlefield, each opponent exiles a card from their hand until Intellect Devourer leaves the battlefield.
Body Thief — You may play lands and cast spells from among cards exiled with Intellect Devourer. If you cast a spell this way, you may spend mana as though it were mana of any color to cast it.

If Intellect Devourer leaves the battlefield before the Devour Intellect ability resolves, opponents won't exile any cards from their hands.

If a card exiled with the Devour Intellect leaves exile for any reason (most likely because it was played using the Body Thief ability), it won't be returned to the opponent's hand if Intellect Devourer leaves the battlefield.

You must still follow all normal timing rules for cards played this way. For example, you may play a land exiled this way only during your main phase and only if you haven't played a land yet this turn.