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Timing is another important consideration
Again, you should immerse yourself in the community: watch videos, follow forums, ask around, and maybe even get into the game yourself so youll have a rough idea of what a card should be worth
Damage counters represent the amount of HP lost up to that point, so this attack will do between 20 damage (if Steelix is at full health) and a frankly outrageous 360 damage if it's down to 10 HP