Cacophodon + Hammerfist Giant + Heroic Intervention

Cacophodon

Hammerfist Giant

Heroic Intervention

How it works

1. Cast Heroic Intervention by paying 1, giving permanents you control hexproof and indestructible until end of turn.
2. Activate Hammerfist Giant by tapping it, dealing 4 damage to each creature without flying and each player.
3. Cacophodon triggers, untapping Hammerfist Giant.
4. Repeat from step 2.