
When Urza enters, create a 0/0 colorless Construct artifact creature token with "This token gets +1/+1 for each artifact you control."
Tap an untapped artifact you control: Add .
: Shuffle your library, then exile the top card. Until end of turn, you may play that card without paying its mana cost.
Urza flood the board with artifacts, tap them for blue mana, and convert that mana into either a giant Construct beater or chained free spells off the ability. You ramp explosively early, then dump your hand and combo or win with overwhelming card advantage and artifact synergies.
Add fast mana (Mana Crypt, Mana Vault, Mox Opal, Chrome Mox) so Urza lands early and immediately generates explosive mana. Tighten the combo package—Thopter Foundry/Sword of the Meek/KCI, Isochron Scepter/Dramatic Reversal, and Mystic Forge/Sensei's Top—and back it with premium counterspells (Force of Will, Mana Drain, Fierce Guardianship) and tutors like Tezzeret the Seeker and Whir of Invention to find your pieces consistently.
The most-played cards for this commander, built from aggregated deck data (the Mythic Graph). Build public decks to seed it.
→ Infinite card draw, Infinite draw triggers, Near-infinite storm count
→ Infinite card draw, Infinite draw triggers, Near-infinite storm count
→ Infinite blue mana, Exile your library, Cast all spells in your library
→ Cast all spells in your library, Infinite blue mana, Infinite creature tokens
→ Infinite card draw, Infinite draw triggers, Near-infinite storm count
Combos via Commander Spellbook.
Same color identity (U), by popularity.