Serrated Biskelion, Thornbite Staff, Thran Vigil, Phyrexian Altar, and Evernight Shade

Prerequisites

• Serrated Biskelion on the battlefield
• Thornbite Staff on the battlefield
• Thran Vigil on the battlefield
• Phyrexian Altar on the battlefield
• Evernight Shade on the battlefield
• Serrated Biskelion does not have summoning sickness
• Thornbite Staff attached to Serrated Biskelion
• Evernight Shade does not have more than one +1/+1 counter on it

Steps

1. Activate Serrated Biskelion by tapping it, putting a -1/-1 counter on it and Evernight Shade
2. Activate Phyrexian Altar by sacrificing Evernight Shade, adding one mana of any color
3. When Evernight Shade dies, its undying ability and Serrated Biskelion trigger
4. Resolve the Serrated Biskelion trigger, untapping it
5. Resolve the Evernight Shade trigger, returning it from your graveyard to the battlefield with a +1/+1 counter on it
6. When Evernight Shade leaves your graveyard, Thran Vigil triggers, putting a +1/+1 counter on Serrated Biskelion
7. Repeat

Results

• Infinite colored mana
• Infinite death triggers
• Infinite ETB
• Infinite lifeloss
• Infinite LTB
• Infinite sacrifice triggers