Breya, Etherium Shaper (EDH / Commander)

Breya, Etherium Shaper + Eldrazi Displacer + Krark-Clan Ironworks

Infinite colorless mana. Infinite damage.

Requires: Ability to produce 2​w​w​u​b​r to cast Breya and Eldrazi Displacer. Ironworks on the battlefield.

Steps:
Cast Breya, creating two 1/1 thopters when she enters the battlefield.
Sacrifice the two thopters to Ironworks, generating c​c​c​c.
Pay 2​c to activate Eldrazi Displacer's ability to exile Breya and return her to the battlefield, triggering her ability to create two more thopters.
Repeat steps 2 and 3 to generate infinite mana.
Pay 2 and sacrifice 2 thopter tokens to activate Breya's ability to deal 3 damage to target player.
Repeat steps 3-5 to kill all opponents.

Breya, Etherium Shaper + Krark-Clan Ironworks + Nim Deathmantle

Infinite colorless mana. Infinite damage.

Requires: Ability to produce w​u​b​r. Deathmantle on the battlefield. Ironworks on the battlefield.

Steps:
Cast Breya, creating two 1/1 thopters when she enters the battlefield.
Sacrifice the two thopters, then Breya to Ironworks generating 6.
Pay 4 to activate Nim Deathmantle's ability, bringing back Breya from the graveyard and triggering her to create two 1/1 thopters.
Repeat steps 2 and 3 to generate infinite mana.
Pay 2 and sacrifice 2 thopter tokens to activate Breya's ability to deal 3 damage to target player.
Sacrifice Breya to Ironworks, generating c​c and paying 4 to bring her back with Nim Deathmantle and trigger her ability to create two 1/1 thopters.
Repeat steps 5 and 6 to kill all opponents.

Ashnod's Altar + Breya, Etherium Shaper + Eldrazi Displacer

Infinite colorless mana. Infinite damage.

Requires: Ability to produce 2​w​w​u​b​r to cast Breya and Eldrazi Displacer. Ashnod's Altar on the battlefield.

Steps:
Cast Breya, creating two 1/1 thopters when she enters the battlefield.
Sacrifice the two thopters to Ashnod's Altar, generating c​c​c​c.
Pay 2​c to activate Eldrazi Displacer's ability to exile Breya and return her to the battlefield, triggering her ability to create two more thopters.
Repeat steps 2 and 3 to generate infinite mana.
Pay 2 and sacrifice 2 thopter tokens to activate Breya's ability to deal 3 damage to target player.
Repeat steps 3-5 to kill all opponents.

Ashnod's Altar + Breya, Etherium Shaper + Nim Deathmantle

Infinite colorless mana. Infinite damage.

Requires: Ability to produce w​u​b​r. Deathmantle on the battlefield. Ashnod's Altar on the battlefield.

Steps:
Cast Breya, creating two 1/1 thopters when she enters the battlefield.
Sacrifice the two thopters, then Breya to Ashnod's Altar generating 6.
Pay 4 to activate Nim Deathmantle's ability, bringing back Breya from the graveyard and triggering her to create two 1/1 thopters.
Repeat steps 2 and 3 to generate infinite mana.
Pay 2 and sacrifice 2 thopter tokens to activate Breya's ability to deal 3 damage to target player.
Sacrifice Breya to Ashnod's Altar, generating c​c and paying 4 to bring her back with Nim Deathmantle and trigger her ability to create two 1/1 thopters.
Repeat steps 5 and 6 to kill all opponents.

Ashnod's Altar + Sword of the Meek + Thopter Foundry

Infinite colorless mana. Infinite lifegain.

Requires: All permanents on the battlefield. 1 available.

Steps:
Pay 1 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 Ashnod's Altar, generating c​c.
Repeat steps 1-3 to generate infinite life and infinite colorless mana.

Krark-Clan Ironworks + Sword of the Meek + Thopter Foundry

Infinite colorless mana. Infinite lifegain.

Requires: All permanents on the battlefield. 1 available.

Steps:
Pay 1 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 c​c.
Repeat steps 1-3 to generate infinite life and infinite colorless mana.

Sword of the Meek + Thopter Foundry + Time Sieve

Infinite turns.

Requires: All permanents on the battlefield. 5 available each turn.

Steps:
Pay 1 and sacrifice Sword of the Meek to Thopter Foundry to create a 1/1 thopter token and gain one life.
Sword of the Meek's ability triggers, attaching itself to the thopter token from the graveyard.
Repeat steps 1 and 2 until you have 5 thopters, paying 5 total.
Activate Time Sieve, sacrificing 5 thopters to take an extra turn.
Repeat.

Phyrexian Metamorph + Sharuum the Hegemon

Infinite ETB triggers. Infinite LTB triggers. Infinite death triggers.

Requires: Sharuum on the battlefield. Phyrexian Metamorph in hand. 3 and either u or 2 life available.

Steps:
Cast Phyrexian Metamorph.
Phyrexian Metamorph enters as a copy of Sharuum.
Sharuum dies to state based actions.
Sharuum's enter the battlefield trigger is put on the stack, targeting Sharuum in your graveyard.
Repeat steps 3-4.

Thopter Assembly + Time Sieve

Infinite turns.

Requires: All permanents on the battlefield. Thopter Assembly is your only thopter. 6 available.

Steps:
At the beginning of your upkeep, Thopter Assembly triggers, returning itself it your hand and creating 5 Thopter tokens .
Sacrifice those tokens to Time Sieve to take an extra turn.
Cast Thopter Assembly for 6.
Repeat for infinite turns.

Ashnod's Altar + Eldrazi Displacer + Myr Battlesphere

: Infinite colorless mana. Infinite ETB triggers. Infinite LTB triggers. Infinite sacrifice triggers. Infinite death triggers.

Requires: All permanents on the battlefield. 2 c available.

Steps:
Spend 2​c to activate Eldrazi Displacer's ability targeting Myr Battlesphere.
Myr Battlesphere ETBs, creating 4 Myr tokens.
Sacrifice two tokens to Ashnod's Altar Ironworks for 4 c.
Use the mana to activate Eldrazi Displacer's ability, targeting the Battlesphere.
Repeat for infinite Myr tokens and colorless mana.

Ashnod's Altar + Eldrazi Displacer + Myr Battlesphere + Skullclamp

Infinite colorless mana. Infinite ETB triggers. Infinite LTB triggers. Infinite sacrifice triggers. Infinite card draw (in intervals of 2). Infinite death triggers.

Requires: All permanents on the battlefield. 2 c available.

Steps:
Spend 2​c to activate Eldrazi Displacer's ability targeting Myr Battlesphere.
Myr Battlesphere ETBs, creating 4 Myr tokens.
Sacrifice two tokens to Ashnod's Altar Ironworks for 4 c.
Use the mana to activate Eldrazi Displacer's ability, targeting the Battlesphere.
Repeat for infinite Myr tokens and colorless mana.
Equip Skullclamp to some of your infinite tokens using some of your infinite mana to draw as many cards as you wish.

Ashnod's Altar + Eldrazi Displacer + Marionette Master

Infinite creature tokens. Infinite ETB. Infinite LTB. Infinite sacrifice triggers. Infinite life loss. Infinite colorless mana. Infinite death triggers.

Requires: All permanents on the battlefield. 2​c available.

Steps:
Pay 2​cto activate Eldrazi Displacer, exiling Marionette Master and returning it to the battlefield.
Marionette Master triggers, creating three 1/1 servo tokens.
Sacrifice two of the tokens to Ashnod's Altar to add 4 c.
Marionette Master triggers twice, casuing target opponent to lose 1 life each time.
Repeat.

Basalt Monolith + Rings of Brighthearth

Infinite colorless mana

Requires: Both cards are on the battlefield. A permanent (or permanents) that can generate at least 2.

Steps:
Tap Basalt Monolith to generate c​c​c.
Untap Basalth Monolith for 3 using the generated mana.
In response to the untap ability on the stack, pay 2 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 c​c​c.
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 c​c​c floating.
Start the cycle over again, this time using 2 of the floating mana to copy the triggered ability from Rings of Brighthearth, netting c each cycle.
Repeat the cycle to create infinite colorless mana.

Mimic Vat + Myr Battlesphere + Time Sieve

Infinite turns.

Requires: Mimic Vat and Time Sieve on the battlefield. Myr Battlesphere imprinted on Mimic Vat. 3 available each turn.

Steps:
Activate Mimic Vat, putting a token copy of Myr Battlesphere onto the battlefield.
The Myr Battlesphere Token triggers, creating four Myr tokens.
Activate Time Sieve, sacrificing Myr Battlesphere and the 4 Myr tokens, getting an extra turn.
Pass the turn.
Repeat.

Dramatic Reversal + Isochron Scepter + Phyrexian Metamorph + Swan Song

Infinite 2/2 Bird tokens.

Requires: All card in hand. An additional enchantment, instant, or sorcery available. 5 available.

Steps:
Cast Isochron Scepter, imprinting Dramatic Reversal.
Cast Phyrexian Metamorph, making it a copy of Isochron Scepter, this time imprinting Swan Song.
Cast any enchantment, instant, or sorcery spell.
Hold priority, and use the 2nd Scepter to counter it with Swan Song.
Hold priority and activate the 1st Scepter, casting Dramatic Reversal, letting it resolve and untapping both Scepters.
With the original spell and the first Swan Song on the stack, use the 2nd Scepter to cast Swan Song on the original spell, this time letting it resolve and creating a 2/2 Bird token.
With the first Swan Song still on the stack, repeat steps 5 and 6, untapping both Scepters and creating a 2/2 token with each iteration.

Ashnod's Altar + Nim Deathmantle + Urza, Lord High Artificer

Infinite blue mana. Infinite Urza activations. Infinite ETB. Infinite death triggers. Infinite LTB. Infinite sacrifice triggers.

Requires: All permanents on the battlefield with a Construct. Or Urza in hand with enough mana to cast him and all other permanents on the battlefield.

Steps:
Cast Urza if necessary.
Sacrifice Urza and his construct to Altar, adding c​c​manc​c.
Use the Deathmantle trigger to return Urza to the battlefield.
Tap Urza's Construct for u.
Repeat steps 2-4 to gain infinite mana.
Activate Urza's final ability to cast a random card from your deck.
Repeat step 6.