Bouncing Destruction

Whenever a creature enters, destroy all other creatures that share a color with it. They can't be regenerated.

Exile target creature. At the beginning of the next end step, return that card to the battlefield under its owner's control with a +1/+1 counter on it.

Transguild Courier is all colors.

Imprint — When this artifact enters, you may exile an instant card with mana value 2 or less from your hand. , : You may copy the exiled card. If you do, you may cast the copy without paying its mana cost.