For the full Commander breakdown see our Best Hobbit MTG Cards for Commander guide
Using Three Dog as an example, his card read, Whenever you attack, you may pay two (mana - the resource used in MtG) and sacrifice an Aura (think of Auras as a power-up that can be cast on a creature card) attached to Three Dog, Galaxy News DJ
The battles, on the other hand, function as a great baseline for newcomers but currently lack the competitive or strategic edge to invest a lot of time into them
For example, if there are two +1/+1 counters on Aerith Gainsborough and it gets three -1/-1 counters, you'll put two +1/+1 counters on each legendary creature you control when Aerith Gainsborough's third ability resolves.
-6: You get an emblem with Creatures you control get +3/+3 and have trample. The Gitrog Monster The Gitrog Monster is a five-cost (three generic, one black, and one green legendary creature) with Deathtouch