mtg warhammer 40k booster box MTG: 40,000 Commander - [40K] 98 nonfoil cards) MTG Brothers' War Collector Booster

The first stage of the saga lets it tap for colorless mana

There are other things to consider, like rarity, but those are the big factors you need to consider when making custom cards

Raphael, the Nightwatcher (Showcase Fracture Foil) Raph is the muscle, and hes looking particularly strong in this Showcase Fracture Foil variant of Raphael, the Nightwatcher

Syr Konrad, the Grim is excellent in this deck because it deals damage to your opponents whenever an enemy creature dies

Adventurers Inn Look, its Radiant Fountain with a subtype

The Moxen (Mox Sapphire, Mox Jet, etc.) What it does: A set of five zero-cost artifacts that each tap for one colored mana