Black Flash

Deathtouch, First Strike, Haste, Devoid
When Black Flash enters the battlefield create X colorless 1/1 Zombie creature tokens with flying
named Time Wraith with "Time Wraith can
block Speedster Creatures. When Time Wraith
deals combat damage to a Speedster creature,
exile both Time Wraith and the creature."
If Black Flash would cause a creature to go to the graveyard from the battlefield, exile that creature instead. Black Flash can only block and be
blocked by Speedster creatures.