If an opponent had two or more lands enter the battlefield under their control this turn, you may payrather than pay this spell's mana cost.
Destroy two target lands. Lavaball Trap deals 4 damage to each creature.
10/1/2009 You may ignore a Trap’s alternative cost condition and simply cast it for its normal mana cost. This is true even if its alternative cost condition has been met.
10/1/2009 Casting a Trap by paying its alternative cost doesn’t change its mana cost or converted mana cost. The only difference is the cost you actually pay.
10/1/2009 Effects that increase or reduce the cost to cast a Trap will apply to whichever cost you chose to pay.
10/1/2009 You may target any two lands, not just ones that entered the battlefield this turn.
10/1/2009 All creatures are dealt damage, not just ones controlled by the targeted lands’ controller(s).
10/1/2009 If both targeted lands are illegal targets by the time Lavaball Trap resolves, the entire spell doesn’t resolve. No creatures are dealt damage.