Agatha of the Vile Cauldron has power 4 or greater.
You control up to five lands that can tap to produce at least ({5} magic symbol) .
Magus of the Candelabra does not have summoning sickness.
Sword of the Paruns attached to Magus of the Candelabra.
Steps
Activate up to five lands by tapping them, adding at least ({5} magic symbol) .
Activate Magus of the Candelabra by tapping it and paying ({1} magic symbol) due to Agatha of the Vile Cauldron, untapping the five lands.
Activate Sword of the Paruns by paying ({3} magic symbol) , untapping Magus of the Candelabra.
Repeat.
Once you have infinite mana, if you have infinite ({R} magic symbol) and ({G} magic symbol) , you may use it to activate Agatha of the Vile Cauldron's ability.
Results
Infinitely large creatures until end of turn except Agatha of the Vile Cauldron.