Infinite colorless mana that can't be spent to cast nonartifact spellsInfinite mana artifacts you control can produceInfinite untap of artifacts you controlInfinite colorless mana
How it works
At the beginning of your upkeep, Karn triggers.
Holding priority, activate Strionic Resonator by paying 2 and tapping it, copying Karn's ability.
Resolve the copy of Karn's ability, adding C for each artifact you control that cannot be spent to cast nonartifact spells.
Activate Clock of Omens by tapping Basalt Monolith and Grim Monolith, untapping Strionic Resonator.
Activate Basalt Monolith's second ability by paying 3, untapping it.
Activate Grim Monolith's second ability by paying 4, untapping it.