Ayula, Queen Among Bears | Sekki, Seasons' Guide | Rukarumel, Biologist

Cards

Cause a creature to enter the battlefield, which is a Bear due to
Rukarumel.
Ayula triggers, causing
Sekki to fight a creature you don't control.
Sekki removes a number of +1/+1 counters from it equal to the damage it would've been dealt and creates that many 1/1 Spirit creature tokens, which are Bears due to
Rukarumel.
When the Spirit Bear(s) enter the battlefield,
Ayula triggers that many times.
If
Sekki is on the battlefield, resolve an Ayla trigger, causing
Sekki to fight a creature you don't control, and then repeat from step 3.
If
Sekki is not on the battlefield, activate
Sekki by sacrificing eight Spirits, returning it from your graveyard to the battlefield as a Bear with eight +1/+1 counters on it due to
Rukarumel.
If
Sekki entered the battlefield,
Ayula triggers, causing
Sekki to fight a creature you don't control.
Repeat from step 3.

You may repeat this loop whenever a creature enters the battlefield under your control.

Destroy all creatures opponents control whenever a creature enters the battlefield under your control.