Sidisi, Regent of the Mire + Karmic Guide + Ashnod's Altar + Giant-Sized Flying Ant

Sidisi, Regent of the Mire

Karmic Guide

Ashnod's Altar

Giant-Sized Flying Ant

How it works

1. Activate Sidisi by tapping it and sacrificing Giant-Sized Flying Ant, returning Karmic Guide from your graveyard to the battlefield.
2. When Karmic Guide enters the battlefield, it triggers, returning Giant-Sized Flying Ant from your graveyard to the battlefield.
3. When Giant-Sized Flying Ant enters the battlefield, it triggers, untapping Sidisi.
4. Activate Ashnod's Altar by sacrificing Karmic Guide.
5. Repeat.

This loop brilliantly scales up the mana value ladder using Sidisi, Regent of the Mire to continuously pull Karmic Guide from the graveyard whenever a creature is sacrificed. To feed this engine, Ashnod's Altar converts our creatures into colorless mana while sending them straight back to the graveyard to set up the next resurrection. Meanwhile, Giant-Sized Flying Ant pulls double duty: its flash and entry trigger let it untap Sidisi on arrival so the tap-ability can be reused immediately, while its mana value of one lower than Karmic Guide fits the exact mathematical requirement for Sidisi's sacrifice exchange.