Malcontent Jump-Pad

Creatures you control have Rush 1. (When this creature enters, the battlefield it gets flying, and haste, and +1/+1 until the end of turn.)
If a creature you control already has Rush, you may use it's Rush ability instead and has, "When this creature enters the battlefield it deals damage equal to it's power to any target."
"Keep your hands and feet inside the ride at all times!"
- hastily written jump-pad warning