The whole plot of Destiny 1's The Dark Below expansion follows the quest to smash that crystal, thus breaking the link and, er, technically, imprisoning him in the moon
You can read our full review on Aetherdrift here
Because of this, a lot of them are quite inflated in price and are likely to come down
that could open the game up to a much wider player base
Moreover, both Horn Attack and Waterfall are normal, damage-dealing attacks with no additional effects ( e.g., some Pokmon have attacks that require the player to discard an energy card)
It costs three mana and is in Blue but whenever your opponents so much as breath (read: cast any spell) they are presented with a choice: pay one mana or let you draw a card