Haste (This creature can attack and {T} as soon as it comes under your control.)
Whenever Ruby attacks while you control a creature with power 4 or greater, Ruby gets +2/+2 until end of turn.
{T}: Add {R} or {G}.
If you controlled a creature with power 4 or greater when you declared Ruby as an attacker, it doesn't matter whether you still control one as her triggered ability resolves. Ruby will still get +2/+2 until end of turn.