Activate Agonasaur Rex's cycling ability by paying {2}{G} and discarding it.
Agonasaur Rex triggers, putting two +1/+1 counters on Evolution Witness.
Evolution Witness triggers, returning Agonasaur Rex from your graveyard to your hand.
Insidious Roots triggers, creating a 0/1 Plant creature token, and then putting a +1/+1 counter on each Plant you control.
Resolve the Agonasaur Rex ability from step 1, causing you to draw a card.
Activate the Plant by tapping it, adding {G}.
Activate Ashnod's Altar by sacrificing the tapped Plant, adding {C}{C}.
Repeat.

Infinite card draw

Infinite draw triggers

Infinite self-discard triggers

Near-infinite +1/+1 counters on certain creatures

Near-infinite creature ETB

Near-infinite creature LTB

Near-infinite death triggers

Near-infinite creature sacrifice triggers

Evolution Witness

Agonasaur Rex

Insidious Roots

Ashnod's Altar

Akroma's Memorial

Activate Agonasaur Rex's cycling ability by paying {2}{G} and discarding it.
Agonasaur Rex triggers, putting two +1/+1 counters on Evolution Witness.
Evolution Witness triggers, returning Agonasaur Rex from your graveyard to your hand.
Kheru Goldkeeper triggers, creating four Treasure tokens.
Resolve the Agonasaur Rex ability from step 1, causing you to draw a card.
Activate three Treasures by tapping and sacrificing them, adding {2}{G}.
Repeat.

Near-infinite artifact ETB

Near-infinite artifact LTB

Near-infinite artifact sacrifice triggers

Near-infinite +1/+1 counters on a creature

Near-infinite Treasure tokens

Near-infinite colored mana

Kheru Goldkeeper

Parallel Lives

Doubling Season

Activate Agonasaur Rex's cycling ability by paying {2}{G} and discarding it.
Agonasaur Rex and Bone Miser trigger.
Resolve the Bone Miser trigger, creating a 2/2 Zombie creature token.
Resolve the Agonasaur Rex trigger, putting two +1/+1 counters on Evolution Witness.
Evolution Witness triggers, returning Agonasaur Rex from your graveyard to your hand.
Kheru Goldkeeper triggers, creating a Treasure token.
Resolve the Agonasaur Rex ability from step 1, causing you to draw a card.
Activate the Treasure by tapping and sacrificing it, adding {G}.
Activate Ashnod's Altar by sacrificing the Zombie token, adding {C}{C}.
Repeat.

Bone Miser

Combos with "Agonasaur Rex"