Breach the Multiverse + Dualcaster Mage + Phantom Train
Breach the Multiverse
Dualcaster Mage
Phantom Train
Infinite creature LTBInfinite creature ETBInfinite creature sacrifice triggersInfinite death triggersInfinite millInfinite self-millPut all creature cards from your library onto the battlefieldInfinite magecraft triggersInfinite recursion of creature cards in your graveyardInfinite +1/+1 counters on a creaturePut 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 Phantom Train 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 loop transforms a massive mill spell into an engine of endless recursion by cycling Dualcaster Mage through the graveyard. When you cast Breach the Multiverse, its initial resolution fills graveyards and sets up the board, but it is the clever timing with Dualcaster Mage's entry trigger that lets you endlessly copy the sorcery. Phantom Train acts as the crucial sacrifice outlet that feeds the mage back into the graveyard while growing itself, allowing you to repeat the process to completely empty every library onto the battlefield.