Glare of Subdual + Solitary Sanctuary + Barrenton Medic

Prerequisites

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Steps

1. 1Activate Glare of Subdual by tapping Barrenton Medic, tapping a creature an opponent controls.
2. 2Solitary Sanctuary triggers, putting a +1/+1 counter on Barrenton Medic.
3. 3Activate Barrenton Medic's second ability by putting a -1/-1 counter on it, untapping it.
4. 4Repeat as desired.

Effects

• Tap all creatures opponents control during each turn