Panoptic Mirror, Strionic Resonator, Ghostly Flicker, and Cabal Stronghold
Here's how the cards Panoptic Mirror, Strionic Resonator, Ghostly Flicker, and Cabal Stronghold results in Infinite LTB, Infinite ETB, Infinite storm count, Infinite magecraft triggers, Infinite black mana, Infinite landfall triggers, Infinite blinking of permanents you control, and Infinite mana permanents you control that enter the battlefield untapped can produce

Panoptic Mirror

Strionic Resonator

Ghostly Flicker

Cabal Stronghold