Well, is it?

Displacement Wave

I had a UG wave/crush build posted on here before it became a standard thing, Druid of the cowl ramping into t3 Veggies would certainly make it better, but I think it will still be too slow unless you are going to be Fogging/Pulse of murasa'ing. t4 vs a good on the play hand from an aggro deck will often put you in burn range.

Imo it has been playable earlier. I did play it in my UG ramp in xbox one tournament. Same deck did win that tournament played by other player. It's not great card but it's ok for some builds.

I used to run it in OG sultai mill. Picking up all my stuff along with opponents was great since it meant not only clearing the board but giving back draws and such.

Displacement Wave is great in ramp decks. It did work when I played ramp.

I've been playing in Temurge this season...it works well in that deck.

Displacement Wave has been secretly great for like, at least 6 months now. It disrupts just about every deck that Blue would have problems with.

Define playable, please.

Maindeck in a competitive build.

I was just thinking its a 2mana one sided sweeper against some of the field now.

That's a high standard. I'd say no. I think you'll have better options most of the time. It's not like you're going to face tokens every other game.

Currently, it rarely is, though it does well in that regard in Temurge. In the AER meta, it very well could be dependent on how prevalent token decks are, which will be dependent upon how prevalent vehicles decks are. Probably worth a shot for a few weeks.