When determining the cost of a card, and multiple effects are reducing the cost, you choose the order in which to apply those effects.Ex.: You control three Machines and Engineer of Leginus, and are attempting to play Remote Control Beast. You may reduce the cost by
for each Machine you control, thus becoming unable to apply Engineer of Leginus' reduction, as it would reduce the free cost below . Or, you can apply Engineer of Leginus' reduction, then reduce the free cost of Remote Control Beast by for each Machine you control, making the total cost .