Striking Thunder, Mirage Ninja

Ninjutsu {w}{w}{w}
Sacrifice Striking Thunder, Mirage Ninja and
return any number of Ninja in play you control
to your hand; target opponent returns that many
of their creatures to their hand.
When Striking Thunder, Mirage Ninja enters
the graveyard, you may have target Ninja deal
damage to one target equal to its power.