Activate Viscera Seer by sacrificing Sun Titan.
When Sun Titan dies, Fungal Fortitude triggers, returning Sun Titan from your graveyard to the battlefield.
When Sun Titan enters, it triggers, returning Fungal Fortitude from your graveyard to the battlefield attached to Sun Titan.
Resolve the Viscera Seer ability.
Repeat.

Infinite ETB

Infinite LTB

Infinite death triggers

Infinite sacrifice triggers

Infinite scry 1

Sun Titan

Viscera Seer

Fungal Fortitude

Activate Bartolomé del Presidio by sacrificing Danitha.
When Danitha dies, Fungal Fortitude triggers, returning Danitha from your graveyard to the battlefield tapped.
When Danitha enters the battlefield, it triggers, returning Fungal Fortitude from your graveyard to the battlefield attached to Danitha.
Resolve the Bartolomé del Presidio ability, putting a +1/+1 counter on it.
Repeat.

Infinite +1/+1 counters on a creature

Danitha, Benalia's Hope

Bartolomé del Presidio

Activate Viscera Seer by sacrificing Shepherd of the Cosmos.
When Shepherd of the Cosmos dies, Fungal Fortitude triggers, returning Shepherd of the Cosmos from your graveyard to the battlefield.
When Shepherd of the Cosmos enters the battlefield, it triggers, returning Fungal Fortitude from your graveyard to the battlefield attached to Shepherd of the Cosmos.
Resolve the Viscera Seer ability, causing you to scry 1.
Repeat.

Shepherd of the Cosmos

Activate Viscera Seer by sacrificing Brotherhood Outcast.
When Brotherhood Outcast dies, Fungal Fortitude triggers, returning Brotherhood Outcast from your graveyard to the battlefield.
When Brotherhood Outcast enters the battlefield, it triggers, returning Fungal Fortitude from your graveyard to the battlefield attached to Brotherhood Outcast.
Resolve the Viscera Seer ability.
Repeat.

Brotherhood Outcast

Activate Viscera Seer by sacrificing Boonweaver Giant
When Boonweaver Giant dies, Fungal Fortitude triggers, returning Boonweaver Giant from your graveyard to the battlefield
When Boonweaver Giant enters, it triggers, returning Fungal Fortitude from your graveyard to the battlefield attached to Boonweaver Giant.
Resolve the Viscera Seer ability from step 1.
Repeat.

Combos with "Fungal Fortitude"