Medomai the Ageless + Sakashima's Student + Mirror Gallery + Slither Blade + Crystal Shard

Medomai the Ageless

Sakashima's Student

Mirror Gallery

Slither Blade

Crystal Shard

How it works

1. Declare Slither Blade 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 Slither Blade 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 Slither Blade by paying .
5. Activate Crystal Shard by paying and tapping it, returning Sakashima's Student from the battlefield to your hand.
6. Pass the turn.
7. Repeat.