Conceptual Magic: Style Meter

Whenever an artifact creature deals damage to a creature or player, add 1 Style counter to Style
Meter. During your end step, you lose 1 Style counter.
{t}, remove X Style counters: you may reduce the cost of an artifact spell by the amount of Style counters removed

"It's ULTRAKILLing time."
—Caleb, Player of RTV