Akali, The Rogue Assassin

Ninjutsu {2}{u}{b} ({2}{u}{b}, Return an unblocked
attacker you control to your hand: Put this card onto
the battlefield from your hand tapped and attacking.)
As long as you've cast an instant this turn, Akali,
The Rogue Assassin is unblockable.
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"Fear the assassin with no master."
— Akali, The Rogue Assassin