PLST: Sakashima's Student Ikoria announce your challenge and declare

announce your challenge and declare how many cards you will flip

or you claim a route on the board by discarding cards that match the color of the route being claimed (with any set of cards allowing you to claim a gray route)

you perform any "end of turn" actions

9 Magic: The Gathering®—Assassin's Creed® Beyond Boosters

PLST: Sakashima's Student Ikoria announce your challenge and declareNinjutsu {1}{U} ({1}{U}, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.) You may have Sakashima's Student enter as a copy of any creature on the battlefield, except it's a Ninja in addition to its other creature types.