Mythos of Illuna | Radiate | Codex Shredder

Cards

There are permanents on the battlefield that enter the battlefield untapped and produce at least ({8} magic symbol) ({R} magic symbol) ({R} magic symbol) .

({5} magic symbol) ({U} magic symbol) ({U} magic symbol) ({R} magic symbol) ({R} magic symbol) available.

Cast
Mythos of Illuna by paying ({2} magic symbol) ({U} magic symbol) ({U} magic symbol) , targeting anything but
Codex Shredder.
In response, cast
Radiate by paying ({3} magic symbol) ({R} magic symbol) ({R} magic symbol) , creating copies of
Mythos of Illuna that target each permanent besides the original target.
Resolve all copies of
Mythos of Illuna, creating token copies of each permanent besides the original target.
Activate the token copy of
Codex Shredder by paying ({5} magic symbol) , tapping it, and sacrificing it, returning
Radiate from your graveyard to your hand.
Activate the token lands or other mana-producing permanents created in step 3 by tapping them, adding at least ({8} magic symbol) ({R} magic symbol) ({R} magic symbol) .
Repeat from step 2, doubling the number of copies created in step 3 each repetition.