my actual urza deck (EDH / Commander)

Combos in the deck:

+Isochron sceptre + dramatic reversal + artifacts - infinite Mana or mill out opponents using codex shredder.
+Isochron sceptre + narset's reversal - recast your own spells/counter ops spells + dramatic reversal + Mana rocks - infinite Mana
+Mystic forge + etherium sculptor + sensei's divining top - draw your whole deck then go infinite with urza
+Mystic forge +sai, master thopterist/Mirrodin besieged + sensei's divining top - draw your whole deck
+Cast enter the infinite off your Mana rocks to draw your whole deck, go infinite and cast walking blaiista for the win.
+Phantasmal image/phyrexian metamorph targets: etherium sculptor, sapphire medallion, urza, riddlesmith, panharmonicon, tribute/trinket mage
+Copy artifact on isochron sceptre to make a new sceptre for reversal spells. Or copy panharmonicon/big Mana rocks/etherium sculptor.
+Make infinite Mana then cast walking ballista for 1000/1000 with back up counter spells to win the game. Cast capsize to get rid of any hexproof giving permanents.
+Capsize with infinite Mana means you can bounce all permanents on board, even your own including urza to make an army of constructs.
+Academy ruins/buried ruins/echo of eons to get your graveyard key cards back into your deck.
+If your combo pieces are exiled, go in the old fashioned way and beat down with an army of 1/1s + giant construct creatures.
+Cavern of souls targeting humans is primarily for casting urza worry free but also works well with riddlesmith, sai, master thopterist, spellseeker, tribute/trinket mage as well as a way to get around controlling decks.