Feldon of the Third Path | Worldgorger Dragon | Rings of Brighthearth

(and one other card)

You control any number of permanents that enter untapped and that can collectively tap to produce at least ({4} magic symbol) ({R} magic symbol) .

Activate any number of permanents by tapping them, adding at least ({4} magic symbol) ({R} magic symbol) .
Activate
Feldon by paying ({2} magic symbol) ({R} magic symbol) and tapping it, targeting
Worldgorger Dragon.
Rings of Brighthearth triggers, causing you to pay ({2} magic symbol) to copy
Feldon's ability targeting
Worldgorger Dragon.
Resolve the copy of
Feldon's ability, creating a token copy of
Worldgorger Dragon.
When the
Worldgorger Dragon token enters, its first ability triggers, exiling all other permanents you control.
Resolve the
Feldon ability from step 2, creating a token copy of
Worldgorger Dragon.
When the
Worldgorger Dragon token enters, its first ability triggers, exiling all other permanents you control.
When the
Worldgorger Dragon token created in step 4 leaves the battlefield, its second ability triggers, returning all cards exiled with it to the battlefield.
Repeat.

Infinite LTB.
Infinite ETB.
Infinite landfall triggers.
Infinite blinking of permanents you control.
Infinite mana permanents you control that enter the battlefield untapped can produce.