Grixis Stax deck, by Yanis B

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

Thopter Foundry + Sword of the Meek + Krark-Clan Ironworks (Infinite colorless mana Infinite lifegain Combo)

Prerequisites

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

Steps

• Pay :mana1: and sacrifice Sword of the Meek to create a 1/1 Thopter token and gaini 1 life
• Sword of the Meek's ability triggers, attaching itself to the Thopter token from the graveyard
• Sacrifice the thopter token to Ironworks, generating :manac::manac:
• Repeat steps 1-3 to generate infinite life and infinite colorless mana

Voltaic Key + Rings of Brighthearth + Everflowing Chalice (Infinite colorless mana Infinite untaps of all artifacts you control Combo)

Prerequisites

- All permanents on the battlefield. Everflowing Chalice has 4 or more charge counters on it.

Steps

• Activate Everflowing Chalice to add :manac::manac::manac::manac: to your mana pool
• Activate Voltaic Key to untap Everflowing Chalice
• Rings of Brighthearth triggers allowing you to copy Voltaic Key's ability and untap Voltaic key with the copy
• Repeat

Voltaic Key + Rings of Brighthearth + Metalworker (Infinite colorless mana Infinite untaps of all artifacts you control Combo)

Prerequisites

- All permanents on the battlefield. 2 or more artifacts in hand. Metalworker is not summoning sick.

Steps

• Activate Metalworker and reveal 2 artifacts to add :manac::manac::manac::manac: to your mana pool
• Activate Voltaic Key to untap Metalworker
• Rings of Brighthearth triggers allowing you to copy Voltaic Key's ability and untap Voltaic key with the copy
• Repeat