Ashling, the Limitless | Dark Ritual | Centaur Omenreader (and one other card)

Cards

Cast
Dark Ritual by paying ({B} magic symbol) , adding ({B} magic symbol) ({B} magic symbol) ({B} magic symbol) .
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, optionally returning a card 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.
Repeat.

This combo has been estimated to be Exhibition (Bracket 1+).