Triskelavus, Cauldron of Souls, Clock of Omens, and Ashnod's Altar

Prerequisites

• Triskelavus on the battlefield
• Cauldron of Souls on the battlefield
• Clock of Omens on the battlefield
• Ashnod's Altar on the battlefield
• Triskelavus does not have a -1/-1 counter on it

Steps

1. Activate Cauldron of Souls by tapping it, giving Triskelavus persist until end of turn
2. Activate Ashnod's Altar by sacrificing Triskelavus, adding
3. When Triskelavus dies, its persist ability triggers, returning it from your graveyard to the battlefield with two +1/+1 counters on it
4. Activate Triskelavus' first ability twice by paying and removing two +1/+1 counters from it, creating two 1/1 Triskelavite artifact creature tokens
5. Activate Clock of Omens by tapping Triskelavus and a Triskelavite, untapping Cauldron of Souls
6. Repeat
7. Once you have infinite Triskelavite tokens, you may sacrifice them to deal infinite damage to any target(s)

Results

• Infinite colorless mana
• Infinite creature tokens
• Infinite damage
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite mana artifacts you control can produce
• Infinite sacrifice triggers
• Infinite untap of artifacts you control