Try Grind campaign, Do daily missions, Don't use Your tokens, Save them for 3k - 4k offers.
Offers Can be Helpful in many Different ways. You can get Lots of resources From Offers, Mythical food, OP items, And Other Game changing Items.
Don't use that Weapon as Food, It is a premium Item Most players Don't Have.
I wouldn't Use it Because it Isn't good, but it's stull Quite Rare to Get from Boxes.