Ashling, the Limitless | Catalyst Elemental | Greenwarden of Murasa

(and one other card)

Greenwarden of Murasa in hand.
Catalyst Elemental in your graveyard.
Ashling and
Centaur Omenreader on the battlefield (
Centaur Omenreader is tapped).

Cast
Greenwarden of Murasa for its evoke cost by paying ({2} magic symbol) due to
Centaur Omenreader.
When
Greenwarden of Murasa enters, its first ability and evoke abilities trigger.
Resolve the first trigger, returning
Catalyst Elemental from your graveyard to your hand.
Resolve the second trigger, sacrificing
Greenwarden of Murasa.
When
Greenwarden of Murasa dies,
Ashling triggers, creating a token copy of
Greenwarden of Murasa with haste.
When the
Greenwarden of Murasa token enters, it triggers, returning
Greenwarden of Murasa from your graveyard to your hand.
Cast
Catalyst Elemental by paying ({R} magic symbol) due to
Centaur Omenreader.
Activate
Catalyst Elemental by sacrificing it, adding ({R} magic symbol) ({R} magic symbol) .
When
Catalyst Elemental dies,
Ashling triggers, creating a token copy of
Catalyst Elemental with haste.
Activate the
Catalyst Elemental token by sacrificing it, adding ({R} magic symbol) ({R} magic symbol) .
Repeat.

If you have at least ({2} magic symbol) ({R} magic symbol) in your mana pool on a particular iteration, step 10 can be skipped.