This is simple build based around the anthem (enchantment that gives +X/+X boost to specific creatures) for level critters.
The game play is straightforward: get at least one level counter on each critter, drop your anthem, and hit hard. If possible, use Proliferate to add more counters.
Here is the anthem doing its thing.
Student of Warfare is the all-star in this deck in a 'Champion of the Parish' way: easy to boost in the right deck.