Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight + Phyrexian Altar + Butcher Ghoul

Prerequisites

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Steps

1. 1Activate Phyrexian Altar by sacrificing Butcher Ghoul
2. 2When Butcher Ghoul dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
3. 3Activate Phyrexian Altar by sacrificing Butcher Ghoul
4. 4When Butcher Ghoul dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
5. 5Butcher Ghoul enters and dies as a state-based action due to having 0 toughness. Its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
6. 6Repeat from step 3.

Effects

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