Activate Myr Welder using Stonespeaker Crystal's ability by tapping it, adding {C}{C}.
Activate Myr Welder using Staff of Domination's first ability by paying {1}, untapping it.
Repeat.

Infinite lifegain triggers

Infinite lifegain

Infinite card draw

Infinite untap of creatures you control

Infinite draw triggers

Infinite mana creatures you control can produce

Infinite colorless mana

Myr Welder

Staff of Domination

Stonespeaker Crystal

Activate Stonespeaker Crystal by tapping it, adding {C}{C}.
Activate Pentavus's first ability by paying {1} and removing a +1/+1 counter from it, creating a 1/1 Pentavite creature token.
Activate Pentavus's second ability by paying {1} and sacrificing the Pentavite.
When the Pentavite dies, Dross Scorpion triggers, untapping Stonespeaker Crystal.
Resolve the Pentavus ability, putting a +1/+1 counter on it.
Repeat.

Infinite LTB

Infinite ETB

Infinite sacrifice triggers

Infinite death triggers

Pentavus

Dross Scorpion

Activate Stonespeaker Crystal by tapping it, adding {C}{C}.
Activate Voltaic Key by paying {1} and tapping it, targeting Stonespeaker Crystal.
Locus of Enlightenment triggers, copying Voltaic Key's ability, targeting Voltaic Key.
Resolve both Voltaic Key abilities, untapping it and Stonespeaker Crystal.
Repeat.

Infinite mana artifacts you control can produce

Infinite untap of artifacts you control

The Enigma Jewel // Locus of Enlightenment

Voltaic Key

Activate Trazyn using Stonespeaker Crystal's ability by tapping it, adding {C}{C}.
Activate Trazyn using Pili-Pala's ability by paying {2} and untapping it, adding one mana of any color.
Repeat.

Infinite colored mana

Trazyn the Infinite

Pili-Pala

Activate Trazyn using Stonespeaker Crystal's ability by tapping it, adding {C}{C}.
Activate Trazyn using Farmstead Gleaner's ability by paying {2} and untapping it, putting a +1/+1 counter on Trazyn.
Repeat.

Infinite +1/+1 counters on a creature

Farmstead Gleaner

Activate Mystic Sanctuary and Stonespeaker Crystal by tapping them, adding {2}{U}.
Cast Ghostly Flicker either from your hand or from the top of your library by paying {2}{U}, blinking Mystic Sanctuary and Stonespeaker Crystal.
When Mystic Sanctuary enters untapped, it triggers, putting Ghostly Flicker from your graveyard onto the top of your library.
Repeat.

Infinite storm count

Infinite magecraft triggers

Infinite landfall triggers

Ghostly Flicker

Mystic Sanctuary

The Reality Chip

Cast Fractured Identity by paying {3}{W}{U}, exiling Immortal Coil and causing each opponent to create a token copy of it.
Activate Stonespeaker Crystal's second ability by paying {2}, tapping it and sacrificing it, exiling all cards from each opponent's graveyard and causing you to draw a card.
Each opponent's Immortal Coil triggers, causing them to lose the game.

Each opponent loses the game

Immortal Coil

Fractured Identity

Activate Tezzeret's first loyalty ability by putting a loyalty counter on it, targeting Stonespeaker Crystal and The Peregrine Dynamo.
Holding priority, activate Stonespeaker Crystal by tapping it, adding {C}{C}.
Activate The Peregrine Dynamo by paying {1} and tapping it, copying Tezzeret's ability, targeting Stonespeaker Crystal and The Peregrine Dynamo.
Resolve the copy of Tezzeret's ability, untapping Stonespeaker Crystal and The Peregrine Dynamo.
Repeat from step 2.

Tezzeret the Seeker

The Peregrine Dynamo

At the beginning of your upkeep, Panoptic Mirror triggers.
Holding priority, activate Stonespeaker Crystal by tapping it, adding {C}{C}.
Activate Strionic Resonator by paying {2} and tapping it, copying Panoptic Mirror's trigger.
Resolve the copy of Panoptic Mirror's trigger, casting a copy of Ghostly Flicker without paying its mana cost.
Resolve the copy of Ghostly Flicker, blinking Stonespeaker Crystal and Strionic Resonator.
Repeat from step 2.

Panoptic Mirror

Strionic Resonator

At the beginning of your upkeep, Panoptic Mirror triggers.
Holding priority, activate Stonespeaker Crystal by tapping it, adding {C}{C}.
Activate Lithoform Engine's first ability by paying {2} and tapping it, copying Panoptic Mirror's trigger.
Resolve the copy of Panoptic Mirror's trigger, casting a copy of Ghostly Flicker without paying its mana cost.
Resolve the copy of Ghostly Flicker, blinking Stonespeaker Crystal and Lithoform Engine.
Repeat from step 2.

Lithoform Engine

Activate Mystic Sanctuary and Stonespeaker Crystal by tapping them, adding {C}{C}{U}.
Cast Ghostly Flicker from the top of your library by paying {2}{U}, blinking Mystic Sanctuary and Stonespeaker Crystal.
When Mystic Sanctuary enters untapped, it triggers, putting Ghostly Flicker from your graveyard onto the top of your library.
Repeat.

Experimental Frenzy

Cast Aminatou by paying {W}{U}{B}.
When Aminatou enters the battlefield, Cadric triggers.
Holding priority, activate Stonespeaker Crystal by tapping it, adding {C}{C}.
Resolve the Cadric trigger, causing you to pay {1} to create a token copy of Aminatou.
Activate Aminatou's second loyalty ability by removing a loyalty counter from it, blinking Stonespeaker Crystal.
Activate the token Aminatou's second loyalty ability by removing a loyalty counter from it, blinking the nontoken Aminatou.
Repeat from step 2.

Combos with "Stonespeaker Crystal"