Glorious Protector + Icewind Stalwart + Soulherder

Glorious Protector

Icewind Stalwart

Soulherder

How it works

1. At the beginning of your end step, Soulherder's second ability triggers, blinking Glorious Protector.
2. Glorious Protector leaves and enters the battlefield, returning Icewind Stalwart from exile to the battlefield, and triggering Soulherder's first ability, as well as Icewind Stalwart and Glorious Protector's enters-the-battlefield abilities.
3. Resolve the Soulherder trigger, putting a +1/+1 counter on it.
4. Resolve the Glorious Protector trigger, exiling Icewind Stalwart until Glorious Protector enters the battlefield.
5. Soulherder's first ability triggers, putting a +1/+1 counter on itself.
6. Resolve the Icewind Stalwart trigger, blinking Glorious Protector.
7. Repeat from step 2.

This clever engine kicks off during your end step when Soulherder targets Glorious Protector, initiating an endless cascade of enters-the-battlefield triggers. As Glorious Protector enters, it conveniently tucks away Icewind Stalwart, which immediately bounces right back out to exile Glorious Protector all over again. Every time these creatures bounce and re-enter, Soulherder happily watches the exile zone fill up and grows infinitely large with +1/+1 counters.