If you control an Elf creature, a Druid creature, a Warrior creature, and a Forest, you may cast Elvish Predation Pack without paying its mana cost.

Prowl {3}{G}{G} (You may cast this for its prowl cost if you dealt combat damage to a player this turn with an Elf, Druid, or Warrior.)

When Elvish Predation Pack enters the battlefield, it fights up to one target creature you don’t control. If Elvish Predation Pack’s prowl cost was paid, instead it deals damage equal to its power to that creature.