Agatha of the Vile Cauldron + Paradise Mantle + Devoted Druid + Barrenton Medic

Agatha of the Vile Cauldron

Paradise Mantle

Devoted Druid

Barrenton Medic

How it works

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

This clever loop turns Devoted Druid's self-countering untap ability into a mana-generating engine by relying on Agatha of the Vile Cauldron to slash activated ability costs down to just one mana. By equipping Paradise Mantle to Devoted Druid or Barrenton Medic, they gain the ability to tap for the exact mana needed to pay for Agatha of the Vile Cauldron's cost reduction, letting you endlessly untap them with their -1/-1 counters. Because Barrenton Medic and Devoted Druid can continually untap themselves this way while paying for Agatha of the Vile Cauldron's pump ability, you can cycle the process infinitely to pump your team's power and toughness to astronomical heights.