Avatar of the Peaks

When Avatar of the Peaks enters the battlefield,
target creature you control gets +3/+3 and gains
double strike and trample until end of turn.
Whenever Avatar of the Peaks attacks, up to X
target creatures you control get +X/+X and gain
first strike, where X is your devotion to red.
(Each {r} in the mana costs of permanents you
control counts toward your devotion to red.)