Card

Metalworker

Mana cost {3}

{T}: Reveal any number of artifact cards in your hand. Add {C}{C} for each card revealed this way.

Part of 45 known combos, 7 of them two-card. 2 official rulings.

Bracket

B1 Exhibition — Not in the same deck as its two-card combo partners: Staff of Domination, Voltaic Construct, Chrome Dome, Umbral Mantle, Cogwork Assembler, Sword of the Paruns, Ringing Strike Mastery
B2 Core — Not in the same deck as its two-card combo partners: Staff of Domination, Voltaic Construct, Chrome Dome, Umbral Mantle, Cogwork Assembler, Sword of the Paruns, Ringing Strike Mastery
B3 Upgraded — Not in the same deck as its early two-card combo partners: Staff of Domination, Voltaic Construct, Umbral Mantle, Cogwork Assembler, Sword of the Paruns, Ringing Strike Mastery
B4 Optimized — allowed: No restriction beyond the banned list
B5 cEDH — allowed: No restriction beyond the banned list

Two-card combo with Staff of Domination, Voltaic Construct, Chrome Dome, Umbral Mantle, Cogwork Assembler, Sword of the Paruns, Ringing Strike Mastery (early with Staff of Domination, Voltaic Construct, Umbral Mantle, Cogwork Assembler, Sword of the Paruns, Ringing Strike Mastery)

Bracket: Lotus Vault analysis, with Commander Spellbook flags

45 known combos, 7 of them two-card.

Staff of Domination + Metalworker
Produces: Infinite card draw, Infinite colorless mana, Infinite draw triggers
View on Commander Spellbook
Voltaic Key + Rings of Brighthearth + Metalworker
Produces: Infinite colorless mana, Infinite untap of artifacts you control, Infinite mana artifacts you control can produce
View on Commander Spellbook
Metalworker + Voltaic Construct
Produces: Infinite colorless mana, Infinite untap of artifact creatures you control
View on Commander Spellbook

2004-10-04 · Wizards of the Coast
This is a mana ability. It does not go on the stack and can’t be responded to.
2004-10-04 · Wizards of the Coast
You can reveal zero cards to gain zero mana.

Rulings: Scryfall · Wizards of the Coast