Pay {7} twice, create 2 copies of Powerstone Shard, leaving {3}.
Tap 2 of the token Powerstone Shards for {6}.
Pay {7}, leaving {2}, to create another token copy of Powerstone Shard.
Tap the 2 remaining untapped Powerstone Shards for {8}.
Pay {7} to create a token copy of Powerstone Shard, tapping it for {5}, leaving you with {8}.
Pay {7} to create a token copy of Powerstone Shard, tapping it for {6}, leaving you with {7}.
Pay {7} to create a token copy of Powerstone Shard, tapping it for {7}, leaving you with {7}.
At This point, each Powerstone Shard will tap for more mana than it costs, allowing you to generate infinite {C}.
Pay infinite {C} to create infinite copies of Cogwork Assembler.

Infinite colorless mana

Infinite creature tokens with haste

Infinite creature ETB

Cogwork Assembler

Powerstone Shard

Activate Chrome Dome by paying {5}, creating a token copy of Powerstone Shard.
Activate a Powerstone Shard by tapping it, adding {C} for each Powerstone Shard you control.
Activate Chrome Dome by paying {5}, creating a token copy of Powerstone Shard.
Activate two Powerstone Shards by tapping them, adding {C}{C} for each Powerstone Shard you control.
Repeat steps 1 and 2 infinitely.

Infinite artifact ETB

Infinite artifact LTB

Infinite artifact sacrifice triggers

Infinite creature LTB

Infinite copies of artifacts you control with haste

Infinite death triggers

Infinite creature sacrifice triggers

Chrome Dome

Activate Urza by paying {6}, creating a token copy of Powerstone Shard that is a 1/1 Soldier in addition to its other types.
Activate the Powerstone Shard token by tapping it, adding {C} for each Powerstone Shard you control.
Repeat two additional times.
Activate the original Powerstone Shard by tapping it, adding {C} for each Powerstone Shard you control.
Repeat steps 1 through 3.

Combos with "Powerstone Shard"