If an opponent had two or more lands enter the battlefield under their control this turn, you may pay {3}{R}{R} rather than pay this spell's mana cost. Destroy two target lands. Lavaball Trap deals 4 damage to each creature.
2009-10-01
All creatures are dealt damage, not just ones controlled by the targeted lands' controller(s).
2009-10-01
Casting a Trap by paying its alternative cost doesn't change its mana cost or mana value. The only difference is the cost you actually pay.
2009-10-01
Effects that increase or reduce the cost to cast a Trap will apply to whichever cost you chose to pay.
2009-10-01
If both targeted lands are illegal targets by the time Lavaball Trap resolves, the entire spell doesn't resolve. No creatures are dealt damage.
2009-10-01
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.
2009-10-01
You may target any two lands, not just ones that entered this turn.