All 20 Combos with Rampant Rejuvenator

Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight + Rampant Rejuvenator + Bartolomé del Presidio

Tutor Chain: Infinite +1/+1 counters on a creature, Infinite creature ETB, Infinite creature LTB, Infinite death triggers, Infinite creature sacrifice triggers, Near-infinite landfall triggers, Put all basic lands from your library onto the battlefield

Activate Bartolomé del Presidio by sacrificing Rampant Rejuvenator. When Rampant Rejuvenator dies, it's innate ability and persist ability each trigger. 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. 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. Resolve the Bartolomé del Presidio ability. Repeat.