Is this being a sorcery an oversight? Too narrow in any case.

Does being tactical mean anything on its own? Given that it doesn't seem to, and there's exactly one card that I can find that cares about the type (which is a mythic funnily enough), the mechanic seems pointless. I guess there's that command ability, but there are no examples of it yet. Also, having two abilities that strictly interact only with each other is very parasitic.

If tactical does do something, it should have a reminder text for it.

@"Too narrow". If this was Tempest or Timespiral block and there was an instant that said "creatures lose shadow until end of turn" that would result in the occasional limited blowout. That said, if you're going to give players the option to blowout other players like that in limited, it should be at uncommon.

I mean, it doesn't matter if the spell is good or not. If the intention of the card is to get an occasional 3 for one, then it's not an appropriate common according to NWO.

Entirely parasitic, and response-only so sideboard. But that's not a reason for it not to exist; just a reason to not do too many of them. And yeah; it certainly wants to be uncommon.

Its very existence warps the environment though. It tells you "Tunnel is not viable" in constructed. If that's intentional - great. Tunnel is a limited only mechanic now; and even there it's risky. Is that really what you mean to do? A card like this usually gets printed in the next set when Wizards realise they accidentally went too far in support of a mechanic and need to reign it in. (And even then it's usually not quite so.. blunt.)

I agree that it looks like it ought to be an instant, though. Otherwise this only nerfs your own creatures.

Insofar as Tactical is concerned- Its similar to Arcane from kamigawa: it will interact with Command (which will function similarly to battalion from RtR; do things during the battle step when you’ve fulfilled a condition, in this case cast a tactical spell), as well as other cards and abilites like the mythic that was mentioned above. For example (off the top of my head) some Tactical sorceries may be cast as instants in response to other tactical spells.

As for Flood out itself, the card was a spur of the moment design choice. There really wasn’t much thought put into it and the criticism against it is valid. I’m going to either edit it or delete it.