Agatha of the Vile Cauldron with power 7 or greater).
Easy Prerequisites
You control a Mountain, Forest or Plains.
Steps
Activate a Mountain, Forest or Plains by tapping it, adding ({1} magic symbol) .
Keeper of Progenitus triggers, adding ({1} magic symbol) .
Activate
Silvanus's Invoker by paying ({1} magic symbol) , untapping the land and causing it to become an 8/8 Elemental with trample and haste in addition to its other types until end of turn.
Repeat.
Notes
Once you have infinite mana, you may tap and untap any other land(s) you control, and use the mana to activate
Agatha of the Vile Cauldron's ability.
Results
Infinite mana lands you control can produce.
Infinite power and toughness for most creatures you control until end of turn.
Infinite untap of lands you control.
Metadata
Bracket tag
SpicyBracket 3-4+
Probably 3 or 4, but hard to classify
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1 · Exhibition5 · cEDH
Bracket tags are estimated from the cards and results of each combo, as a guideline rather than a strict classification.