Gatta and Luzzu + Walking Ballista + Benevolent Hydra

Gatta and Luzzu

Walking Ballista

Benevolent Hydra

How it works

1. Cast Gatta and Luzzu by paying 2.
2. When Gatta and Luzzu enters the battlefield, it triggers, targeting Walking Ballista.
3. Activate Walking Ballista by removing a +1/+1 counter from it, targeting itself, but instead putting two +1/+1 counters on it due to Gatta and Luzzu and Benevolent Hydra.
4. Activate Walking Ballista by removing a +1/+1 counter from it, dealing 1 damage to any target.
5. Repeat from step 3.