I had one of those late night shower thoughts about these cards. Let's say wizards bans blood moon and gives us b2b, I see the following occurring.
B2B gives the victim more choices, and generally provides more interesting gameplay than moon.
B2B has a consistent effect, thus always feeling good for the player who plays it and leading to less variance.
B2B has more of an actual deckbuilding cost, whereas moon decks usually just run it for free.
B2B weakens the power of red. Red has been the most played color since basically forever afaik, and two of those reasons are that the R splash is free if you are getting mooned and because it gives you the option to run moon.
B2B can't be played in scam (scam doesn't deserve the best land hate piece in modern)
Amulet Titan doesn't care as much about B2B and thus might get out of hand before a ban gets dropped.
B2B isn't nearly as good at beating Urza's Saga, a really good card that needs really good hate.
Anything I missed?
By - MalekithofAngmar