Originally brewed by Saffron Olive, (https://www.mtggoldfish.com/articles/much-abrew-proliferate-engine-modern), but quite heavily modified by myself.
Infinite Turns, Infinite Mana, Your Entire Deck in Your Hands. What more could you want?
First up, Infinite Turns. The card that enjoyed adding the most was Magistrate's Scepter. With this and 3x Coretapper / 2x Coretapper + 1x Contagion Clasp / 1x Coretapper + 1x Contagion Clasp + 1x Surge Node / 1x Contagion Clasp + 2x Surge Node / Probably more combinations, we can add 3 surge counters to Magistrate's Scepter, tap it and remove 3 to take a turn, and do the same thing until we draw enough of the right cards to win.
Infinite Mana and/or card draw next. While the original deck, made by Seth(probably better know as SaffronOlive), had ways to just get balls amounts of mana through one loop, and infinite through another, this takes too much. The original infinite mana loop required 8+ mana on rocks, a Batterskull in play or in hand and a Paradox Engine in play. With the replacement of Batterskull with Emry, Lurker of the Loch, the loop only requires 3/6 mana on rocks, a Paradox Engine in play, and either a Mind Stone, Hedron Archive or a Coretapper (sadly no card draw here, but still infinitely store mana on all your artifacts and screw your opponents viles/explosives/chalices).
1: Tap all of your rocks down, and activate any abilities of cards you want to / have enough extra mana to, eg. moving counters with Surge Node / Coretapper, fetching your win con with Planar Portal, proliferating with Contagion Clasp.
2: Crack your combo piece and draw your 1/2 cards / add Counters to an artifact.
3: Tap Emry, Lurker of the Loch, targeting your combo piece.
4. Cast your combo piece, untapping your non lands with Paradox Engine.
5. Repeat steps 1-4 until you have an Emrakul, the Aeons Torn in hand and 15+ mana or a Walking Ballista in hand and 40+ mana.
If you have the Emrakul, play it, but keep continuing the loop until you can take infinite turns with Magistrate's Scepter, attacking constantly and stopping your opponent from every having permanents or another turn.
If you don't have an infinite mana source, but you do have a Paradox Engine and 6+ mana on rocks, with a Planar Portal in play, you can fetch up all your 0 drop cards, play them for free, and profit off of whatever other effects you have on board, until you win.
Karn, the Great Creator can fetch up the one of Paradox Engine in the sideboard if you haven't found one yet. I usually fetch the Ensnaring Bridge first up to protect him from being one hit by most creature decks.
Mystic Forge + Paradox Engine let's you churn through your deck, exiling the cards you don't like multiple times.
