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 creature ETB

Infinite creature LTB

Infinite death triggers

Infinite creature sacrifice triggers

Infinite scry 1

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

Viscera Seer

Custodi Soulbinders

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 most creatures you control

Cathars' Crusade

Earthcraft

Ashnod's Altar

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 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

Combos with "Custodi Soulbinders"