Samut, the Driving Force

Legendary Creature — Human Warrior Cleric • Mana cost: {3}{R}{G}{W} • Aetherdrift • Rare

First strike, vigilance, haste
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.)
Other creatures you control get +X/+0, where X is your speed.
Noncreature spells you cast cost {X} less to cast, where X is your speed.

Illustrated by Chris Rallis.