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Dimir Inverter, Lotus Breach, the new version of Hardened Scales... Pioneer is flush with combo decks theses days. But that doesn't mean we can't try and fit in one more!
Welcome to Grumgully combo. With either Grumgully, the Generous or Renata, Called to the Hunt in play, every (non-Human) creature enters the battlefield with a +1/+1 counter on it. So you can play a creature like Walking Ballista for free, and it will enter as a 1/1. Not bad.
If Animation Module is also in play, things get more interesting. When your Walking Ballista gets its counter from Grumgully or Renata, that triggers the Module's ability, allowing you to pay one mana for a 1/1 colorless Servo... which gets its own +1/+1 counter, triggering the Module again.
With a little setup, you can get a pile of 2/2 servo creatures for one mana each, a rate so good it's typically reserved for Legendary creatures and multi-format all-stars. Then you lean back while your little robot friends carry you to victory.