Mystery Booster Commander Edition

Start Your Engines! // Max Speed

Legendary Creature — Dinosaur Berserker

Double strike
Start your engines! (If you have no speed, it starts at 1. It increases once on each of your turns when an opponent loses life. Max speed is 4.)
Whenever Tsagan attacks, creatures you control get +1/+0 until end of turn for each creature you control with first strike or double strike.
Max speed — Tsagan has deathtouch and other creatures you control have first strike.