The Assassin

Haste
Whenever The Assassin attacks, put two 2/1
Black Assassin creature tokens with ''whenever
this creature is blocked, deal 2 damage to
blocking creature'' onto the battlefield under
your control attacking.
At your endstep, destroy all Assassin tokens under
your control and give The Assassin +X/+X
where X is the number of Assassin tokens
destroyed this way.