Draconic Mentor

Whenever a creature enters the battlefield under
your control you may pay {r/g}{r/g}{r/g}{r/g}. If you do,
that creature gains haste and trample until end of
turn.
{r/g}{r/g}{r/g}: Target creature gains +1/+0 and reach
until end of turn.
You may not be a dragon, but you have the rage of
one burning inside you.