The Swarm

Flying, Has +1/+1 for each swarm token on the Battlefield
Whenever you Play a card,You may pay one of any color, if you do, create X Swarm tokens that are copies of this card, except they have, "When The Swarm leaves the battlefield, Sacrifice this token." Where X is the amount of Colors used to cast that spell
"How many are their?" The hunter asked,
"To many", His partner replied.