Activate Tortured Existence by paying {B} and discarding Basking Rootwalla into exile, targeting Blazing Rootwalla.
Basking Rootwalla's madness ability triggers, causing you to pay {0} to cast it from exile.
Resolve the Tortured Existence ability, returning Blazing Rootwalla from your graveyard to your hand.
Activate Phyrexian Altar by sacrificing Basking Rootwalla, adding {B}.
Activate Tortured Existence by paying {B} and discarding Blazing Rootwalla into exile, targeting Basking Rootwalla.
Blazing Rootwalla's madness ability triggers, causing you to pay {0} to cast it from exile.
Resolve the Tortured Existence ability, returning Basking Rootwalla from your graveyard to your hand.
Activate Phyrexian Altar by sacrificing Blazing Rootwalla, adding {B}.
Repeat.

Infinite death triggers

Infinite creature ETB

Infinite creature LTB

Infinite creature sacrifice triggers

Infinite self-discard triggers

Infinite storm count

Basking Rootwalla

Blazing Rootwalla

Tortured Existence

Phyrexian Altar

Move to your cleanup step.
Discard down to your maximum hand size, ensuring to discard Basking Rootwalla.
Basking Rootwalla is discarded into exile, triggering its madness ability, causing you to pay {0} to cast it from exile.
Activate Altar of Dementia by sacrificing Basking Rootwalla.
When Basking Rootwalla dies, Enduring Renewal triggers, returning Basking Rootwalla from your graveyard to your hand.
Resolve the Altar of Dementia ability, causing target player to mill cards equal to Basking Rootwalla's power.
Once the stack is empty and all players pass priority, another cleanup step occurs.
Repeat from step 2.

Infinite mill

Infinite self-mill

Enduring Renewal

Altar of Dementia

Move to your cleanup step.
Discard down to your maximum hand size, ensuring to discard Basking Rootwalla.
Basking Rootwalla is discarded into exile, triggering its madness ability, causing you to pay {0} to cast it from exile.
When Basking Rootwalla enters the battlefield, Blasting Station triggers, untapping itself.
Activate Blasting Station by tapping it and sacrificing Basking Rootwalla.
When Basking Rootwalla dies, Enduring Renewal triggers, returning Basking Rootwalla from your graveyard to your hand.
Resolve the Blasting Station ability, dealing 1 damage to any target.
Once the stack is empty and all players pass priority, another cleanup step occurs.
Repeat from step 2.

Infinite damage

Blasting Station

Activate Basking Rootwalla's cycling ability by paying {U} and discarding it, discarding it into exile due to its madness ability.
Basking Rootwalla's madness ability triggers, causing you to pay {0} to cast it from exile.
Activate Phyrexian Altar by sacrificing Basking Rootwalla, adding {U}.
When Basking Rootwalla dies, Mortuary triggers, putting it from your graveyard onto the top of your library.
Resolve the cycling ability from step 1, causing you to draw Basking Rootwalla from the top of your library.
Repeat.

Infinite draw triggers

Fluctuator

Rhet-Tomb Mystic

Mortuary

Activate Sadistic Hypnotist by sacrificing a creature, causing you to discard Basking Rootwalla and Blazing Rootwalla into exile.
Basking Rootwalla and Blazing Rootwalla's madness abilities trigger.
Resolve the Basking Rootwalla trigger, causing you to pay {0} to cast it from exile.
When Basking Rootwalla enters the battlefield, Cloudstone Curio and Molten Echoes trigger.
Resolve the Cloudstone Curio trigger, choosing to return nothing to your hand.
Resolve the Molten Echoes trigger, creating a token copy of Basking Rootwalla with haste.
When the creature token enters the battlefield, Cloudstone Curio triggers, returning Basking Rootwalla from the battlefield to your hand.
Resolve the Blazing Rootwalla trigger from step 2, causing you to pay {0} to cast it from exile.
Repeat steps 4 through 7 one additional time using Blazing Rootwalla instead.
Repeat from step 1.

Infinite creature tokens

Cloudstone Curio

Sadistic Hypnotist

Molten Echoes

Combos with "Basking Rootwalla"