Olivia, Crimson Bride, Port Razer, and Viscera Seer

Prerequisites

• Olivia, Crimson Bride on the battlefield
• Port Razer in the graveyard
• Viscera Seer on the battlefield
• Olivia does not have summoning sickness
• An opponent is unable to block your creatures

Steps

1. Declare Olivia as an attacker, attacking an opponent unable to block your creatures
2. Olivia triggers, returning Port Razer from your graveyard to the battlefield tapped and attacking that opponent
3. Deal combat damage with Port Razer, triggering its ability, untapping all creatures you control and getting an additional combat phase after this one
4. Activate Viscera Seer by sacrificing Port Razer, scrying 1
5. Repeat

Results

• Infinite combat phases
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers
• Infinite scry 1