Vylen, Claw of Bolas

+2: Target player reveals their hand. You may choose up to 1 creature card. That player discards that card. Triggered abilities do not activate.
-1: Vylen, Claw of Bolas gains hexproof until your next upkeep.
X: Vylen, Claw of Bolas deals X damage to target creature. If that creature would die, exile it instead.