For people worrying about this being used in Cubelock, Void Terror never saw play in that archetype despite being pretty similar. I think this card is a much more interesting option for wild zoo with its PO and eggs synergy since zoo is all about trading until you have empty board.
EDIT: Also, for the WOW junkies here, pretty sure that armor set on the ratcatcher is an old rogue one. Seems odd they put it on a warlock card.
Attack with the Cube. Use this on the Cube and attack a minion with your new 6/8. Use your two Doomguards to do whatever the hell you want. Or your Voidlords to look cool and take screenshots.
This is just stupid.
Sitting out until Cubelock gets nerfed. No point in trying out any other archetype before the nerf, since there is no point, you will not come to any conclusion and might end up wasting your dust (as casuals).
This is Jade Druid and Pirate Warrior all over again. Blizzard is effing dumb.
Edit: Oh and btw, after you play Ratcatcher, you can still do more stuff with the remaining mana... >.>