Cavern Kindlehorn

Stockpile {2} (Exile this card from your hand: It gains "{2}: Put a cache counter on this card." and "You may cast this card from exile as long as it has a cache counter on it with its cost reduced by {1} for each cache counter on it.")
When Cavern Kindlehorn enters the battlefield, it deals X damage to target creature an opponent controls where X is the number of cache counters on it as it was cast.