During the declare blockers phase, when you recieve priority, activate Sakashima's Student's Ninjutsu ability by paying ({1} magic symbol) ({U} magic symbol) 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.
Deal combat damage with Sakashima's Student, causing you to take an additional turn after this one.
Cast Slither Blade by paying ({U} magic symbol) .
Activate Aegis Automaton by paying ({4} magic symbol) ({W} magic symbol) , returning Sakashima's Student from the battlefield to your hand.