[2021] Weird Interaction: Underworld Breach and Light Up the Stage

So, I mainly run mono-red Memekin in Historic. I know it's not optimized, but I enjoy it and get a decent win rate with it.

I added 2 Underworld Breach recently to give me a little more long game and prevent some fizzles. Then something weird happened: when I would escape Light Up the Stage with Breach, the exiled cards to pay escape would line up next the ones I could cast with Stage. I thought it was a bug at first, but actually, the wording is such that, yes, the cards used to escape are "Exiled with Light Up the Stage" and so can be cast with it. It's actually a really awesome interaction and if I have Light plus 3 cmc 1 instants or sorceries in my yard plus 2 Runaway Steam-Kins or Birgi, God of Storytellings it becomes "infinite".

Explanation: I cast Stage and exile the 3 cards that cost R plus two off the top. I then cast the three cards, which go back to my graveyard, netting 6 effective mana (technically the Steam-Kin doesn't give me "mana" but it's effectively the same over the course of the combo), with that mana, I can re-cast Stage and the 3 cards, and the loop goes on. Add in either 1 damage dealing spell or one of my pingers, and OP is dead, otherwise I've just drawn my whole deck and... well... OP probably is still dead.

Yeah, the combo is SUPER clunky and inefficient, it's like 3 pieces in play plus 4 in my yard plus whatever, but because it just incidentally lands in my game plan and works with otherwise strong cards, it's something I found super interesting.

Deck list for the record (or if anyone suggests upgrades):

Creature Spells:

2 Wayward Guide-Beast

4 Runaway Steam-Kin

4 Thermo-Alchemist

4 Electrostatic Field

3 Birgi, God of Storytelling

2 Guttersnipe

Non-Creature Spells

4 Crash Through

4 Rile

2 Spikefield Hazard

4 Warlord's Fury

2 Flame of Keld

2 Underworld Breach

4 Light Up the Stage

2 Skewer the Critics

Lands (Land count is very low because drawing lands leads to a fizzle and I have alternative mana sources):

1 Castle Embereth

13 Mountain

3 Fabled Passage

Sideboard (less tuned than the rest of the deck because I mostly do BO1):

2 Claim the Firstborn

2 Spikefield Hazard

2 Cinderclasm

2 Embereth Shieldbreaker

2 Immolation Shaman

2 Lava Coil

2 Magmatic Channeler

1 Roiling Vortex

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