Galen, Dinosaur Rider

Haste, first strike
As long as Galen, Dinosaur Rider is attacking, Dinosaurs you control get +1/+1 and first strike
until end of turn.
{2}{r}{w}: Galen, Dinosaur Rider gets +X/+X until
end of turn where X is the amount of Dinosaurs
you control. Activate this ability only once
per turn.