>would buster blade be cheaper though?
Not really, they should require the same amount of gems since you need to reset a Mini BOX twice in both cases.
Plus you need at least 2 Buster Blader, DDS and one Dark Paladin
buster blader is pretty solid to go for (especially with all of the Koaki decks in Legend).
Honestly you could save gems and use your moms credit card on Gears. Less than $20, that’s essentially mowing the lawn once.