Attack with Triton Shorestalker and when it isn't blocked, cast Sakashima's Student's for it's ninjutsu cost, paying ({1} magic symbol) ({U} magic symbol) and returning Triton Shorestalker to hand.
Have Sakashima's Student enter the battlefield as a copy of Medomai the Ageless and deal combat damage, gaining you an extra turn.
During your second main phase, cast Triton Shorestalker for ({U} magic symbol) .
Return Sakashima's Student to your hand with Crystal Shard for ({U} magic symbol) .