To determine the total cost of a spell, start with the mana cost or alternative cost you're paying (such as an escape cost), add any cost increases, then apply any cost reductions
When we looked at Fatal Push last week, it seemed that there was a normal and Inked version, in keeping with the Venom Unleashed drop
Nimble Brigand You only need a few cheap interactive spells to enable Nimble Brigand, which is exactly what you want with a blue card like this
My favorite is Overprotect, and from its namesake, you know what it can do
This is, of course, less of an issue for blue, but in the right deck, its not hard to imagine the Discovery becoming a must-answer target, else you outdraw the table in no time