Ratadrabik of Urborg + Leyline of Singularity + Mirror Image
How it works
- Cast Mirror Image by paying its mana cost. Choose to have it enter as a copy of Ratadrabik.
- Put Mirror Image into your graveyard due to the legend rule.
- When Mirror Image dies, Ratadrabik triggers, creating a token copy of Mirror Image that is a copy of Ratadrabik but is a 2/2 Zombie in addition to its other types.
- Repeat from step 2 using the Mirror Image token instead.
This looping mechanism is brilliantly enabled by Leyline of Singularity, whose passive enchantment effect turns all nonland permanents into legendaries right from the start of the game, applying even to Mirror Image as it enters. With that rule in place, casting Mirror Image to copy Ratadrabik of Urborg immediately triggers the legend rule, sending the copy straight to the graveyard. Because Ratadrabik of Urborg sees another legendary creature die, its triggered ability responds by creating a non-legendary 2/2 Zombie token copy of Mirror Image—which, crucially, still enters as a copy of Ratadrabik of Urborg. Repeating this loop endlessly creates an infinite sequence of enter-the-battlefield, leave-the-battlefield, and death triggers that forces a draw if no player can interrupt it.