Question about my bakugan ability card?

Magic the gathering question: if an ability doesn't cause a card to tap, can i use it more than once?

• for example, the card knollspine invocation reads as follows: x, discard a card with converted mana cost x: knollspine invocation deals x damage to target creature or player. since it's ability doesn't cause the card to tap can i play it more than once per turn as long as i have mana to tap and cards to discard?

• Answer:

  Yes, you may use the ability as many times as you want, provided that you can pay its cost. For example, you can activate the ability in Knollspine Invocation as many times as you want, as long as you have the mana to pay the X mana cost and you have cards in your hand to discard. You can't play the ability without paying the cost. Hope that helped.