When Tidehollow Sculler enters, target opponent reveals their hand and you choose a nonland card from it. Exile that card. When Tidehollow Sculler leaves the battlefield, return the exiled card to its owner's hand.
2021-03-19
If Tidehollow Sculler leaves the battlefield before its first ability has resolved, its second ability triggers. This ability does nothing when it resolves. Then its first ability resolves and exiles the chosen card indefinitely.