Let's take a look at two different Location cards, both included in the Ruby & Sapphire deck: As you can see from the above, these cards have a cost in Ink to play them (and both of these examples can be used as ink in your inkwell)
Loxodon Warhammer [Cat deck]: Useful, always useful
Your creatures won't get more powerful if more than one artifact entered the battlefield under your control this turn
Cards like Lilo, Making a Wish and Stitch, New Dog were just two of the many cheap threats packed into the amber/x aggro shell, with the purpose of getting characters into play as fast as possible, and then using some number of Lanterns or shifting using Stitch, New Dog to get Stitch, Rock Star into play ahead of curve
Likewise, if youre going to make a Control deck, then youll probably want to use Blue
These are the leftover commons and uncommons after we sort collections for our brick and mortar store