Activate Kenrith's fifth ability by paying {B} due to Agatha, returning King Darien XLVIII from your graveyard to the battlefield.
Activate Relic of Legends' second ability by tapping King Darien XLVIII, adding {B}.
Activate King Darien XLVIII by sacrificing it.
Repeat.

Infinite ETB

Infinite LTB

Infinite death triggers

Infinite sacrifice triggers

Kenrith, the Returned King

Relic of Legends

Agatha of the Vile Cauldron

King Darien XLVIII

Activate King Darien XLVIII by sacrificing it.
When King Darien XLVIII dies, Ratadrabik triggers, creating a token copy of King Darien XLVIII that is a 2/2 legendary Zombie in addition to its other types.
Resolve the King Darien XLVIII ability.
Repeat using the King Darien XLVIII token

Ratadrabik of Urborg

Leyline of Singularity

Activate King Darien XLVIII by sacrificing it.
When King Darien XLVIII dies, Luminous Broodmoth triggers, returning King Darien XLVIII from your graveyard to the battlefield without a flying counter on it due to Solemnity.
Resolve the King Darien XLVIII ability.
Repeat.

Solemnity

Luminous Broodmoth

Activate King Darien XLVIII by sacrificing it.
When King Darien XLVIII dies, its persist ability triggers, returning it from your graveyard to the battlefield without a -1/-1 counter on it due to Vizier of Remedies.
Resolve the King Darien XLVIII ability.
Repeat.

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

Vizier of Remedies

Activate King Darien XLVIII by sacrificing it.
When King Darien XLVIII dies, Yedora triggers, returning King Darien XLVIII from your graveyard to the battlefield face-down as a Forest land.
When King Darien XLVIII enters the battlefield, Zimone triggers.
Holding priority, activate King Darien XLVIII by tapping it, adding {G}.
Resolve the Zimone trigger, turning King Darien XLVIII face-up.
Resolve the King Darien XLVIII ability from step 1.
Repeat.

Infinite green mana

Infinite landfall triggers

Zimone, Mystery Unraveler

Yedora, Grave Gardener

Cast King Darien XLVIII by paying its mana cost if it is in your hand. Otherwise, activate Tayam by paying {3} and removing three counters from creatures you control, causing you to mill three cards and return King Darien XLVIII from your graveyard to the battlefield with a vigilance counter on it.
When King Darien XLVIII enters the battlefield, Metastatic Evangel triggers, causing you to put a +1/+1 counter on Cryptic Trilobite and Basking Broodscale and a vigilance counter on King Darien XLVIII.
Basking Broodscale triggers, creating a 0/1 Eldrazi Spawn creature token that enters with a vigilance counter on it.
Activate Cryptic Trilobite by removing a +1/+1 counter from it, adding {C}{C} that can only be spent to activate abilities.
Activate the Eldrazi Spawn by sacrificing it, adding {C}.
Activate Tayam by paying {3}, removing both vigilance counters from King Darien XLVIII and another counter from a creature you control.
Holding priority, activate King Darien XLVIII by sacrificing it.
Resolve the Tayam ability, causing you to mill three cards and return King Darien XLVIII from your graveyard to the battlefield with a vigilance counter on it.
Repeat from step 2.
Repeat.

Infinite self-mill

Infinite proliferate

Tayam, Luminous Enigma

Metastatic Evangel

Cryptic Trilobite

Basking Broodscale

Activate a basic Swamp by tapping it, adding {B}.
Activate Kenrith's fifth ability by paying {B} due to Agatha, returning King Darien XLVIII from your graveyard to the battlefield.
Activate Earthcraft by tapping King Darien XLVIII, untapping the basic Swamp.
Activate King Darien XLVIII by sacrificing it.
Repeat.

Combos with "King Darien XLVIII"