Kestri, Canine King

Whenever you cast a canine spell (canines are foxes, dogs, jackals, and wolves), create a treat token, its a artifact with "sacrifice this artifact: target canine gains indestructible until end of turn".

Whenever you sacrifice a treat, you get an experience counter

All canines you control have +X/+X, where X
is the number of experience counters you have.
They also gain vigilance, trample, and haste.