Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight, Phyrexian Altar, and Rampant Rejuvenator

Prerequisites

• Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight on the battlefield
• Phyrexian Altar on the battlefield
• Rampant Rejuvenator on the battlefield

Steps

1. Activate Phyrexian Altar by sacrificing Rampant Rejuvenator
2. When Rampant Rejuvenator dies, it's innate ability and persist ability each trigger
3. Resolve the trigger from Rampant Rejuvenator's innate ability, allowing you to search your library for a number of basic land cards and put them onto the battlefield
4. Resolve the persist trigger, returning Rampant Rejuvenator from your graveyard to the battlefield without a -1/-1 counter on it due to its replacement effect
5. Repeat

Results

• Infinite ETB
• Infinite LTB
• Infinite colored mana
• Infinite death triggers
• Infinite sacrifice triggers
• Near-infinite landfall triggers
• Put all basic lands from your library onto the battlefield