Feldon of the Third Path
Worldgorger Dragon
Urabrask the Hidden
Lithoform Engine

   Prerequisites

What do I need to start this combo?
Worldgorger Dragon in your graveyard.
All other permanents on the battlefield.
You control any number of permanents that enter untapped and that can collectively tap to produce at least 4.

   Steps

How does this combo work?
1
Activate any number of permanents by tapping them, adding at least 4.
2
Activate Feldon by paying 2 and tapping it, targeting Worldgorger Dragon.
3
Holding priority, activate Lithoform Engine by paying 2 and tapping it, copying Feldon's ability targeting Worldgorger Dragon.
4
Resolve the copy of Feldon's ability, creating a token copy of Worldgorger Dragon.
5
When the Worldgorger Dragon token enters, its first ability triggers, exiling all other permanents you control.
6
Resolve the Feldon ability from step 2, creating a token copy of Worldgorger Dragon.
7
When the Worldgorger Dragon token enters, its first ability triggers, exiling all other permanents you control.
8
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.
9
Repeat.

   Results

What do I get from this combo?
Infinite mana lands you control can produce
Infinite LTB
Infinite ETB
Infinite landfall triggers
Infinite mana permanents you control that enter the battlefield untapped can produce
Infinite blinking of permanents