Activate Krark-Clan Ironworks by sacrificing the artifact creature that can be cast using {C}{C}, adding {C}{C}.
When the creature dies, Mortuary triggers, putting the creature on top of your library.
Activate Wood Sage by tapping it, naming the creature put on top of your library, then revealing the top four cards of your library and putting the creature into your hand.
Cast the creature by paying its mana cost.
When the creature enters the battlefield, Intruder Alarm triggers, untapping all creatures.
Repeat.
If the artifact creature can be cast using {C} or less, this combo nets infinite colorless mana.

Infinite colorless mana

Infinite death triggers

Infinite ETB

Infinite LTB

Infinite mana creatures you control can produce

Infinite sacrifice triggers

Infinite storm count

Infinite untap of creatures

Infinite untap of creatures you control

Wood Sage

Intruder Alarm

Mortuary

Krark-Clan Ironworks

Activate Ashnod's Altar by sacrificing the creature that can be cast using {C}{C}, adding {C}{C}.
When the creature dies, Mortuary triggers, putting the creature on top of your library.
Activate Wood Sage by tapping it, naming the creature put on top of your library, then revealing the top four cards of your library and putting the creature into your hand.
Cast the creature by paying its mana cost.
When the creature enters the battlefield, Intruder Alarm triggers, untapping all creatures.
Repeat.
If the creature can be cast using {C} or less, this combo nets infinite colorless mana.

Ashnod's Altar

Activate Phyrexian Altar by sacrificing the creature that can be cast using one colored mana, adding one mana of any color.
When the creature dies, Mortuary triggers, putting the creature on top of your library.
Activate Wood Sage by tapping it, naming the creature put on top of your library, then revealing the top four cards of your library and putting the creature into your hand.
Cast the creature by paying its mana cost.
When the creature enters the battlefield, Intruder Alarm triggers, untapping all creatures.
Repeat.

Phyrexian Altar

Combos with "Wood Sage"