Rule 356.7
Costs may be Energy costs, Power costs, or non-standard costs. Example: A card reads "As an additional cost to play me, kill a friendly unit." Killing a friendly unit is an additional cost to play that card.
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Costs may be Energy costs, Power costs, or non-standard costs. Example: A card reads "As an additional cost to play me, kill a friendly unit." Killing a friendly unit is an additional cost to play that card.