Roboute Guilliman, Ultramar

Flash.
Haste, Menace, Lifelink, Vigilante.

The Emperor's Will—Whenever creature you control attacks, you draw a card. If it's Land or Astartes creature put it onto the battlefield, tapped.

Codex Astartes—You have no maximum hand size
and each Astartes creature you control can block an additional creature each combat.