Hearthstone‘s new legendary spells are insanely powerful, and the latest one to be revealed is no exception.

Each class is getting a legendary spell for the first time in The Boomsday Project, Hearthstone‘s next expansion.

The Soularium is a legendary one mana Warlock spell. It draws three cards, but at the end of your turn any unused cards from the three will be discarded.

Obviously one mana for three cards is crazy. It’s one of the best draw spells ever printed—but it comes with that clear drawback. If you can’t play the cards that turn, they are gone for the rest of the game. If you have a crucial combo piece, say Bloodreaver Gul’dan, you can’t afford to lose that. It’s going to need a very specific deck to make this spell work, but it’s so powerful people are definitely doing to try.

The Boomsday Project is the second expansion of the current Standard year, the Year of the Raven. It will add 135 new cards to the game, including new keywords like Magnetic. It is currently available to pre-order, with all the cards becoming available on Aug. 7.