Grand Architect + Knacksaw Clique + Stonework Packbeast + Training Grounds

U identity

Commander legal

The 4 combo pieces

• Grand Architect
• Knacksaw Clique
• Stonework Packbeast
• Training Grounds

How to execute it

1. Activate Grand Architect's second ability by tapping Knacksaw Clique, adding {C}{C} that can only be spent to cast artifact spells or to activate abilities of artifacts.
2. Activate Stonework Packbeast by paying {1}, adding {U}.
3. Activate Knacksaw Clique by paying {U} and untapping it, exiling the top card of an opponents library and allowing you to cast it this turn.
4. Repeat.

What the combo produces

• Cast any number of spells from opponents' libraries
• Exile each opponent's library
• Infinite colored mana
• Infinite colorless mana that can only be spent to activate abilities of artifacts
• Infinite colorless mana that can only be spent to cast artifact spells