There's no gameplay balance - and if the two sets were designed to be played like this anyway, then the act of splitting them up makes little to no sense
But these kinds of effects always net you more than you think and make board wipes a little more survivable in your creature decks
It was a very good deal in terms of value, costing under half of the estimated value of the cards included
Its always fun to find something like Gray Merchant of Asphodel to play on curve, but sometimes you just need Rakdos Charm against your graveyard-playing friend
Marcy: So more often than not a 1 mana spell that does 4 damage in Commander
Unfortunately, this also means that blues methods for mana ramp really arent all that well defined, resulting in a very limited pool of cards to choose from without adding other colors, many of which are also mechanically unique