Master Chief, Spartan Savior

Vigilance, Hexproof from red

Mjolnir Armor — Prevent all non-combat damage that would be dealt to Master Chief.

Tactical Brilliance — Whenever Master Chief attacks, you may search your library for an Equipment card, reveal it, and put it into your hand. Shuffle.

If Cortana is on the battlefield, Master Chief gets +2/+2 and can’t be blocked by more than one creature.