For X and one Blue or Black, you choose a color, then an opponent exiles X cards from the top of their library
Dispelling Exhale and Caustic Exhale are commons, so it might seem superfluous to replace them
I do think its a little simple and relies too heavily on your opponents having creatures, but at the end of the day if they dont have any creatures to goad, youre going to be connecting with your dragons anyway, so who cares
Of course, if you are on the aggro spellslinger plan, say with a number of Dragons that care about casting noncreature spells, then this thing is going to fit into that plan wonderfully, and be one of your best options
In practice, this meant games were essentially a race to Lin Sivvi, and whoever would play their copy first would lock their opponent out of playing their Lin Sivvi, which allowed the first player to tutor up a bunch of Rebels and win the game
For the small price of a single black mana plus an ante of an additional card, you get to draw a full hand of seven new cards