Aikawa, the Ephemeral

Shadow (This creature can block or be blocked
by only creatures with shadow.)
{x}{u}{u},{t}: Put X +1/+1 counters on Aikawa. It
phases out. (Treat it and anything attached to it
as though they don't exist until its controller's
next turn.)
Don't be paralyzed by death, but also don't be fooled
into thinking it won't come.