Mythos of Illuna | Radiate | Greenwarden of Murasa

Cards

Greenwarden of Murasa on the battlefield.
Mythos of Illuna and
Radiate in hand.
Enough lands or other mana producers total among all players which can be activated the turn they enter the battlefield to produce at least ({3} magic symbol) ({R} magic symbol) ({R} magic symbol) (this condition is trivially easy).
({5} magic symbol) ({U} magic symbol) ({U} magic symbol) ({R} magic symbol) ({R} magic symbol) available.

Cast
Mythos of Illuna targeting anything but
Greenwarden, holding priority, and then cast
Radiate targeting
Mythos of Illuna.
When
Radiate resolves you will have
Mythos copies targeting every targetable permanent (except what the original
Mythos card is targeting).
When each of the copies resolve, target
Radiate in your graveyard with the new
Greenwarden token's ability and return
Radiate to your hand.
Before the original
Mythos of Illuna card resolves, cast
Radiate again targeting
Mythos by spending mana from the tokens you just created.
Repeat this process, effectively doubling the number of copies created, allowing you to return
Radiate and another card with two
Greenwarden triggers.
Repeat.

Infinite copies of all targetable permanents.
Infinite storm count.
Return any number of cards (except
Mythos of Illuna) from your graveyard to your hand any number of times.