Super Cool Dragon

Flying, Trample
When Super Cool Dragon enters the battlefield,
search your library for any number
of dragon cards with total power {x} or less,
where {x} is the total power of dragons
you control.
{3}{u}{b}{r}: Put a +1/+1 counter on target dragon
you control.
{1}{r}{u/b}: Dragons you control get +2/+1
until end of turn.