Also, do not forget abou Petty Theft/Brazen Borrower -- a bounce spell combined with a 3/1 flyer that can also be flashed onto the battlefield
This looks like a four damage burn spell, but in the absence of an effect like Heroic (which, yes, is on a single Boros uncommon), this is the kind of combat trick that tends to be a one-for-two
No other card does so much in that spot
Those counters turn into a little toolbox: You can pump your creature, shrink or pick off other creatures, or gain life, all on demand
There are tons of ways to make Treasures these days, which also means that in some Cubes youll be able to get good mileage out of Kelloggs ability to steal opposing creatures
For example, if you find yourself having trouble beating Burn even though you think the matchup is close, you could add an extra Gnaw to the Bone in your sideboard