Tour Guide into Leviair

That combo's mere existence makes D.D. Crow somewhat worse.

Okay, maybe not its mere existence, but the fact that almost all of the decks that you would be using D.D. Crow against play easily summoned Level 3's lets them potentially plus after you remove stuff with D.D. Crow.

So, what are we supposed to use instead of D.D. Crow? Effect Veiler? If you use D.D. Crow, then you probably already use Effect Veiler. Even so, you can't replace all of your Crows with Veilers.

Basically, anything that banishes can now be easily countered by most decks.

You may think that it's a little crazy to worry this much about that, but the thing is that good players will probably save their Tour Guides until they need to use them. That means that they'll be dropping it when they have no other plays, or when they need to get something back from the banished pile.

Effectively, banishing something for them could end in a huge plus for your opponent. Of course, you could possibly have Effect Veiler ready to negate Tour Guide, but if you have Crows and Veilers every time you need them, then I don't see how you would be losing anyways.

What I'm looking at right now is using Shadow-Imprisoning Mirror to stop Tour Guide, Sangan, and other Darks they happen to play. There's also Pulling the Rug, and even Black Horn of Heaven (maybe not, though, since they would still plus off of Sangan...).

The problem with all of these cards is that they can be too situational. You're opponent's playing Dark Worlds? Sure, play Shadow-Imprisoning Mirror. They're playing Debris Plants? Pulling the Rug and Black Horn of Heaven work. Zombies? Shadow-Imprisoning Mirror and Black Horn of Heaven would probably be okay.

There's not much overlap for these cards, so it may or may not be efficient to Side Deck them, depending on the deck that you're playing.

But, I suppose we don't have to worry much about that until we find out what the new ban list is. Sangan might just be banned, making this much less of a hassle...