Activate Ghave's first ability by paying {1} and removing a +1/+1 counter from Ghave, creating a 1/1 Saproling token.
When Saproling token enters the battlefield, Woodland Champion triggers, putting a +1/+1 counter on itself.
Activate Ashnod's Altar by sacrificing Saproling token, adding {C}{C}.
Activate Ghave's first ability by paying {1} and removing a +1/+1 counter from Woodland Champion, creating a 1/1 Saproling token.
Repeat from step 2.

Infinite colorless mana

Infinite death triggers

Infinite creature ETB

Infinite creature LTB

Infinite creature sacrifice triggers

Ghave, Guru of Spores

Woodland Champion

Ashnod's Altar

Put a +1/+1 counter on any creature you control.
Animation Module triggers, causing you to pay {1} to create a 1/1 Servo artifact creature token.
The Servo enters the battlefield, triggering Woodland Champion.
Holding priority, activate Ashnod's Altar by sacrificing the Servo, adding {C}{C}.
Resolve the Woodland Champion trigger, putting a +1/+1 counter on it.
Repeat from step 2.

Infinite +1/+1 counters on a creature

Animation Module

Put a +1/+1 counter on any creature you control.
Animation Module triggers, causing you to pay {1} to create a 1/1 Servo artifact creature token.
The Servo enters the battlefield, triggering Woodland Champion.
Holding priority, activate Phyrexian Altar by sacrificing the Servo, adding {1}.
Resolve the Woodland Champion trigger, putting a +1/+1 counter on it.
Repeat from step 2.

Phyrexian Altar

Put a +1/+1 counter on any creature you control.
Animation Module triggers, causing you to pay {1} to create a 1/1 Servo artifact creature token.
The Servo enters the battlefield, triggering Woodland Champion.
Holding priority, activate Krark-Clan Ironworks by sacrificing the Servo, adding {C}{C}.
Resolve the Woodland Champion trigger, putting a +1/+1 counter on it.
Repeat from step 2.

Combos with "Woodland Champion"