Fastest Thing Alive

Gotta Go Fast! (If you have no speed, it starts
at 1. It increases once on each of your turns
when an opponent loses life. Max Speed is four.)
{t}:Target creature gets +X/+X until end of
turn, where X is your speed.
Max Speed: There is no limit to how much
speed you can have. 'Max Speed' effects are active as long as your speed is 4 or above.