Sol Ring Forge

At the beginning of each player's upkeep, that player may create a colorless artifact token named Sol Ring with "{t}: Add {c}{c}."

Colorless spells you cast cost {1} less to cast for each artifact named Sol Ring that your opponents control.

When you cast a colorless spell with mana value 5 or more, if no mana was spent to cast it, draw 2 cards.

Sol Ring Forge can be your commander.