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

Medomai the Ageless

Triton Shorestalker

Sakashima's Student

Erratic Portal

Mirror Gallery

How it works

1. Attack with Triton Shorestalker and when it isn't blocked, cast Sakashima's Student's for it's ninjutsu cost, paying 1 and returning Triton Shorestalker to hand.
2. Have Sakashima's Student enter the battlefield as a copy of Medomai the Ageless and deal combat damage, gaining you an extra turn.
3. During your second main phase, cast Triton Shorestalker for .
4. Return Sakashima's Student to your hand with Erratic Portal for 1.
5. Pass the turn to yourself and repeat.