Agatha of the Vile Cauldron, Earthcraft, Devoted Druid, and Barrenton Medic

Prerequisites

• Agatha of the Vile Cauldron on the battlefield
• Earthcraft on the battlefield
• Devoted Druid on the battlefield
• Barrenton Medic on the battlefield
• Agatha of the Vile Cauldron has power 4 or greater
• Devoted Druid does not have summoning sickness
• You control at least one basic Mountain

Steps

1. Activate Devoted Druid's first ability by tapping it, adding
2. Activate a basic Mountain by tapping it, adding
3. Activate Earthcraft by tapping Barrenton Medic, untapping the Mountain
4. Activate Agatha of the Vile Cauldron by paying at most , giving all other creatures you control +1/+1, trample and haste until end of turn
5. Activate Devoted Druid and Barrenton Medic's second abilities by putting a -1/-1 counter on them, untapping them
6. Repeat

Results

• Infinitely large creatures until end of turn except Agatha of the Vile Cauldron, Devoted Druid and Barrenton Medic