Urza, Lord High Artificer deck, by Samuel Z.

Painter's Servant + Grindstone (Mill a single opponent's library Combo)

Prerequisites

- Both cards in hand. :mana3: available.

Steps

• Cast Painter's Servant, declaring any color
• Cast Grindstone and pay :mana3: activate its ability, targeting a player
• Due to Painter's Servant ability, any cards milled by Grindstone will share the same color, which will mill out a single player

Rings of Brighthearth + Basalt Monolith (Infinite colorless mana Combo)

Prerequisites

- Both cards are on the battlefield. A permanent (or permanents) that can generate at least :mana2:.

Steps

• Tap Basalt Monolith to generate :manac::manac::manac:
• Untap Basalth Monolith for :mana3: using the generated mana
• In response to the untap ability on the stack, pay :mana2: with some permanent (or permanents) to use Rings' triggered ability to copy Basalt Monolith's untap ability
• Put the second untap ability on the stack as well
• You now have 2 untap abilities on the stack
• Let one untap ability resolve, then in response, tap Basalt monolith generating :manac::manac::manac:
• In response to tapping Basalt Monolith, let the first untap ability on the stack resolve
• At this point, Basalt Monolith is untapped and you have :manac::manac::manac: floating
• Start the cycle over again, this time using :mana2: of the floating mana to copy the triggered ability from Rings of Brighthearth, netting :manac: each cycle
• Repeat the cycle to create infinite colorless mana

Urza, Lord High Artificer + Basalt Monolith + Rings of Brighthearth (Infinite colorless mana Infinite blue mana Cast any cards from your library Combo)

Prerequisites

- All permanents on the battlefield. :mana1: available.

Steps

• Tap Basalt Monolith adding :manac::manac::manac:
• Untap Basalt Monolith with its ability
• Rings of Brighthearth's ability triggers before Basalt Monolith untaps
• Activate Rings of Brighthearth and tap it for :manau: with Urza, Lord High Artificer untapping Basalt Monolith
• Tap Basalt Monolith for :manac::manac::manac: while the First untap ability from Basalt Monolith is on the stack
• Repeat using mana from Basalt Monolith netting :manac: each time until you have infinite mana
• Once you have infinite mana use Urza, Lord High Artificer's ability to tap Basalt Monolith for :manau:, then activate Basalt Monolith's ability to untap itself netting :manau: each time
• Use Urza, Lord High Artificer's ability to exile your library allowing you to cast any card without paying their mana costs