I know lots of people want to use these guys in battle, so here's a house rule for it.
The completed unit counts as one of your bakugan. However, it is still subject to the same rules when it comes to playing it. You must roll (NOT slide) the entire thing onto the gate card from two cards away and it must open on the card, as per regular rules.
Now, a lot of you will be saying "But that's impossible"! That's the idea. It is impossible to roll the two Maxos's and Meta-Altair won't open on a card in its official configuration.
So instead you HAVE to use a card that allows you to place a Bakugan instead of rolling it. This means you'd have to waste space where Akimaro's Surprise could go to place Perfect Aim instead just to play the darn thing. Not only that, but afterwards you wouldn't be able to use it again and one Haos 2 or Duck and Win can make it seem futile. You'd have to build an entire strategy around it to get it to work at all and that would be taxing. I think it would make for an interesting game-play element, however.
Note: After hitting the table, combine the total G-powers and the bakugan takes on the attribute of the primary bakugan (Helios, Altair, and Dragonoid) unless there are traps (Dragonoid) In which case, choose an atribute from one of the traps like normal.
Opinions?