Rite of Passage + Triskelion + Solid Ground

Rite of Passage

Triskelion

Solid Ground

How it works

1. Activate Triskelion by removing a +1/+1 counter from it, dealing 1 damage to itself.
2. Rite of Passage triggers, putting two +1/+1 counters on Triskelion.
3. Repeat an arbitrarily large number of times.
4. Move to the next turn, removing all damage marked on Triskelion.
5. Activate Triskelion by removing a +1/+1 counter from it, dealing 1 damage to any target.
6. Repeat step 5 as desired.

This loop relies on Solid Ground's replacement effect to turn a modest self-inflicted wound into a net-positive engine. By using Triskelion to ping itself for one damage, you trigger Rite of Passage, but Solid Ground ensures that the resulting reward yields an extra counter every time. This lets you endlessly grow Triskelion's power and store up an infinite pile of counters, which you can then turn into infinite damage directed at any target once the dust settles.