Because we didn't always have access to multicolor (this was back in the day where we wouldn't put multicolor cards in sets without a multicolor theme), we decided the ability made the most sense in black
they're perfect for building decks, playing Limited games with friends, and are tons of fun to open LAUNCH YOUR COSMIC COLLECTIONEach Play Booster contains 14 cards of rarity Rare or higher, including the possibility of Special Guest Mythic Rare from Magics history featuring new Borderless art SHINING FOIL IN EVERY PACKEvery booster also includes at least 1 shining Traditional Foil card of any rarity
You rarely see it outside of the command zone, though it works in any strategy that cares about proliferation or +1/+1 counters
Its a good as an engine in the early game because it doubles your Zombie count with no real issue or effort, and its good in the late game as a massive threat
Ad Nauseam Ad Nauseam, when set up, is by far the most powerful effect on this list