1) Opponent played Bello, Bard of the Brambles, which was his commander.
2) I played Oko, Thief of Crowns, and used his +1 ability targeting Bello.
3) Opp played Chaos Warp, removing Oko from play (not sure if this is relevant, but it happened)
4) Opp played Berserker's Charge
5) Bello turned...