To spend ink when playing cards or activating abilities, exert the number of cards equal to the ink cost (by turning them 90 degrees sideways)
That said, Plum lacks depth in the power department
It perpetually keeps the Emperor alive despite having been mortally wounded years before, and with its unique ability, it can do the same for you, too, if a game starts going south
Throughout the game, this represents a lot of free damage and a 3/2 can even brawl really well, too
Its a cheap enchantment for enchantress decks, and it has two card types for delirium and other decks that care about that
Radstorm may take a little setting up to achieve its full potential, but with the right combo, it can wipe out an entire table, leaving you the sole victor standing in the irradiated rubble