Activate Viscera Seer by sacrificing Custodi Soulbinders.
When Custodi Soulbinders dies, its persist ability triggers, returning it from your graveyard to the battlefield without a -1/-1 counter on it due to its replacement effect.
Resolve the Viscera Seer ability.
Repeat.

Infinite ETB

Infinite LTB

Infinite death triggers

Infinite sacrifice triggers

Infinite scry 1

Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight

Viscera Seer

Custodi Soulbinders

Activate Antler Skulkin by paying {2}, giving Custodi Soulbinders persist until end of turn.
Activate Ashnod's Altar by sacrificing Custodi Soulbinders, adding {C}{C}.
When Custodi Soulbinders dies, its persist ability triggers, returning it to the battlefield from your graveyard with at least one +1/+1 counter on it due to its first ability.
Repeat.

Antler Skulkin

Ashnod's Altar

Activate a basic Plains by tapping it, adding {W}.
Activate Custodi Soulbinders by paying {2}{W} and removing a +1/+1 counter from it, creating a 1/1 Spirit creature token.
The Spirit enters the battlefield, triggering Cathars' Crusade, putting a +1/+1 counter on each creature you control.
Activate Earthcraft by tapping the Spirit token, untapping a basic Plains.
Activate Ashnod's Altar by sacrificing the Spirit, adding {C}{C}.
Repeat.

Infinite +1/+1 counters on creatures you control

Cathars' Crusade

Earthcraft

Activate Emiel the Blessed by paying {3}, blinking Custodi Soulbinders. Custodi Soulbinders enters with at least five +1/+1 counters due to its replacement effect.
Activate Custodi Soulbinders using Ramos's ability by removing five +1/+1 counters from it, adding {W}{W}{U}{U}{B}{B}{R}{R}{G}{G}.
Repeat.

Infinite blinking

Infinite colored mana

Ramos, Dragon Engine

Agatha's Soul Cauldron

Emiel the Blessed

Activate Mimic Vat, making a token copy of Custodi Soulbinders which enters as a 0/0 with five +1/+1 counters.
Go to combat, moving all counters from Ozolith onto Sage of Hours.
Activate Sage of Hours, removing all +1/+1 counters on it, gaining an extra turn.
Pass the turn.
At the beginning of your end step, the Custodi Soulbinders token triggers, exiling itself.
The Ozolith triggers, putting five +1/+1 counters on itself.
Repeat.

Combos with "Custodi Soulbinders"