Sakashima's Student Mirage Create X 1/1 green Elf

Create X 1/1 green Elf Warrior creature tokens

Flash Flying You may cast colorless spells and artifact spells as though they had flash

Cheer — Whenever one or more creatures you control with counters on them deal combat damage to a player

Sacrifice an artifact: Put a +1/+1 counter on this creature

then return him to the battlefield transformed under his owner's control

Sakashima's Student Mirage Create X 1/1 green ElfNinjutsu {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 this creature enter as a copy of any creature on the battlefield, except it's a Ninja in addition to its other creature types.