Furthermore, it grants him access to a destructive force had been sealed away by the world being split, the Void
It already passively shapes up your hand, but it enables so many things from discard decks to madness/mayhem to cast-from-exile strategies that just want another payoff for playing their game
Akroma, Vision of Ixidor Alharu, Solemn Ritualist Alisaie Leveilleur Ardenn, Intrepid Archaeologist Keleth, Sunmane Familiar Leonardo, the Balance Livio, Oathsworn Sentinel Prava of the Steel Legion Radiant, Serra Archangel Rebbec, Architect of Ascension Regna, the Redeemer Rhoda, Geist Avenger Sylvia Brightspear Trynn, Champion of Freedom Yoshimaru, Ever Faithful
That's a powerful way to ramp up your mana base with some mana-producing artifacts, or you could just have two Darksteel Colossuses bouncing around