Slogurk, the Overslime + Primal Prayers + Aetherstorm Roc + Putrid Imp

Slogurk, the Overslime

Primal Prayers

Aetherstorm Roc

Putrid Imp

How it works

1. Activate Putrid Imp by discarding a land card.
2. Slogurk triggers, putting a +1/+1 counter on it.
3. Resolve the Putrid Imp ability.
4. Repeat from step 1 two additional times.
5. Activate Slogurk by removing three +1/+1 counters from it, returning it from the battlefield to your hand.
6. When Slogurk leaves the battlefield, it triggers, returning three land cards from your graveyard to your hand.
7. Cast Slogurk by paying E due to Primal Prayers.
8. When Slogurk enters, Aetherstorm Roc triggers, causing you to get E.
9. Repeat.

This ingenious loop turns Putrid Imp into a self-discard engine that feeds land cards directly into your graveyard, which in turn grows Slogurk, the Overslime with +1/+1 counters and triggers its ability to grab them right back. Once Slogurk has accrued enough counters to bounce itself to your hand, its leaving-the-battlefield trigger replenishes your hand with those discarded lands. You can then replay Slogurk essentially for free thanks to the energy-cheating static ability of Primal Prayers, while every creature entry is seamlessly subsidized by Aetherstorm Roc generating the necessary energy to keep the cycle spinning infinitely.