Gemstone Caverns (274) [The List] Rock/Effect OR a Spell/Trap Card is

OR a Spell/Trap Card is activated: Pay half your Life Points

you can't use this attack during your next turn

along with 3 brand-new World Premiere cards to give these monsters a new power boost

this attack does 10 damage times the number of damage counters on Aggron

Gemstone Caverns (274) [The List] Rock/Effect OR a Spell/Trap Card isRarity: M #: 274 Card Type: Legendary Land Description: If Gemstone Caverns is in your opening hand and you're not playing first, you may begin the game with Gemstone Caverns in play with a luck counter on it. If you do, remove a card in your hand from the game. T Add 1 to your mana pool. If Gemstone Caverns has a luck counter on it, instead add one mana of any color to your mana pool.