Breach the Multiverse + Dualcaster Mage + Carrion Feeder
Breach the Multiverse
Dualcaster Mage
Carrion Feeder
Infinite creature LTBInfinite creature ETBInfinite creature sacrifice triggersInfinite death triggersInfinite millInfinite self-millPut all creature cards from your library onto the battlefieldInfinite magecraft triggersInfinite +1/+1 counters on a creatureInfinite recursion of creature cards in your graveyardPut all creature cards from each opponent's library onto the battlefield under your control
How it works
Cast Breach the Multiverse by paying its mana cost, targeting any applicable target.
Holding priority, cast Dualcaster Mage by paying its mana cost.
When Dualcaster Mage enters, it triggers, targeting Breach the Multiverse.
Holding priority, activate Carrion Feeder by sacrificing Dualcaster Mage.
Resolve the Dualcaster Mage trigger, copying Breach the Multiverse, with the copy targeting Dualcaster Mage
Resolve the Breach the Multiverse copy, returning Dualcaster Mage from your graveyard to the battlefield.
Repeat from step 3.
This ingenious loop begins by casting Breach the Multiverse to tear open both players' libraries and dredge up the tools we need, while Carrion Feeder waits in the wings to feed on our sacrificial offerings. By flashing in Dualcaster Mage while the original sorcery is still on the stack, its enters-the-battlefield trigger is able to target the very spell that summoned it, creating an endless feedback loop of copied sorceries. Each iteration allows Breach the Multiverse to repeatedly resurrect Dualcaster Mage from the graveyard after Carrion Feeder sends it to the bin, milling everyone out and stealing every creature and planeswalker from all libraries in the process.