Medomai the Ageless + Sakashima's Student + Mirror Gallery + Triton Shorestalker + Equilibrium

Medomai the Ageless

Sakashima's Student

Mirror Gallery

Triton Shorestalker

Equilibrium

How it works

1. Declare Triton Shorestalker as an attacker.
2. During the declare blockers phase, when you recieve priority, activate Sakashima's Student's Ninjutsu ability by paying 1 and returning Triton Shorestalker from the battlefield to your hand, putting Sakashima's Student from your hand onto the battlefield tapped and attacking as a copy of Medomai.
3. Deal combat damage with Sakashima's Student, causing you to take an additional turn after this one.
4. Cast Triton Shorestalker by paying .
5. Equilibrium triggers, causing you to pay 1 to return Sakashima's Student from the battlefield to your hand.
6. Pass the turn.
7. Repeat.

This ingenious loop circumvents Medomai the Ageless's dreaded restriction against attacking during extra turns by using Sakashima's Student to enter the battlefield already attacking, bypassing the "declare attackers" step entirely. Because Mirror Gallery is in play, you don't have to worry about the legend rule when your clone enters alongside the original, while Triton Shorestalker provides the unblocked attacker needed to fuel the Ninjutsu swap in the first place. Finally, Equilibrium ties the whole mechanism together by letting you bounce Sakashima's Student back to your hand when you recast Triton Shorestalker, resetting the board so you can repeat the process on every single extra turn.