Patrolling Peacemaker + Bloodcrazed Hoplite + Switcheroo

Patrolling Peacemaker

Bloodcrazed Hoplite

Switcheroo

How it works

1. Donate control of Bloodcrazed Hoplite to an opponent.
2. Put a +1/+1 counter on Bloodcrazed Hoplite either by proliferating or by any other method.
3. Bloodcrazed Hoplite triggers, targeting any creature controlled by you or another opponent.
4. When the opponent commits that crime, Patrolling Peacemaker triggers, causing you to proliferate and put a +1/+1 counter on Bloodcrazed Hoplite.
5. Repeat from step 3.