AEthersnipe + Progenitor Mimic
Return a nonland permanant to your opponents hand and gain a 4/4 every upkeep
Acidic Slime + Aeve, Progenitor Ooze + Progenitor Mimic
Printing an Acidic Slime every turn is already busted, getting to destroy an enchantment, land, or artifact every upkeep means that your opponent looses a lot of backup. However, printing a new Aeve, Progenitor Ooze every upkeep, which, because it would be a token, ignores legendary, means that you get a new Aeve, Progenitor Ooze with an insane power toughness every turn due to the amount of Acidic Slimes and Aeve, Progenitor Oozes you have
Awakener Druid + Progenitor Mimic
You get a new 1/1 every upkeep that turns a forest into a 4/5. Gives you something to do with your lands if you have nothing to play, gives you a lot of blockers, and gives you something to swing with.
Guard Gomazoa + Progenitor Mimic
The jellyfish printer! The backbone of this deck for... obvious reasons, printing a Guard Gomazoa every upkeep means that you have a surplus of blockers that can tank any amount of damage.
Progenitor Mimic + Wall of Stolen Identity
Tap an opponents creature every round, and gain its abilities for yourself
Progenitor Mimic + Quicksilver Gargantuan
This combo is horrifying. When Quicksilver Gargantuan copies your Progenitor Mimic that means you have two printers of whatever the Progenitor Mimic was printing. One that prints it at its original power/toughness, and one that prints 7/7s. While this works with anything, I personally try to copy a Guard Gomazoa printer. You print 2 blockers that can tank any amount of damage every upkeep, except one does 7 damage back. Makes it so that nothing is getting through to you.
