Taking this opportunity, I will express my long-held, extremely important, and expert opinion about Zwai, which has finally solidified after the mini-pack: the card is not just mediocre in terms of its character, art, and voice acting, but also mechanically.
Firstly, 7 power points are too expensive to clear the board of small (3-4 health) followers. By the time you reach these power points, your face will already be smashed, or you'll spend the whole game being blocked. No one plays Zeenitra in Dragon except for me and maybe a couple of other autists, but at least the Dragon can ramp up and play it while it's still possible. And you can cast the spell as early as turn five.
Secondly, without evolution, playing it costs seven power points for a 3-1 rush and skipping a turn – that’s simply embarrassing. And with evolution, it's just like Zeenitra, only without ramping, and on the condition that the opponent has weak followers or that you have enough suicidal puppets to weaken the creatures before Vicki attacks. It's not impressive.
And thirdly, it's a useless and completely reactive move from which you don't get anything - you slightly clear the board, possibly lose your last evolution point, and then your two weaklings with 1-2 health get taken down by any area-of-effect attack or Knight, Magic Missile, Filena, Fairy with Bramble, or without, etc.
In this regard, the spell is a hundred times better because it gives you a puppet, whether enhanced or not, and even when making a reactive move, you still accumulate power points towards Orcish Nuke; basically, it adds to your game plan. I used to think this effect was insignificant, but it turns out it's super useful, and thanks to this single spell, it's no longer a low-tier card.
Also, there's another "pleasant" bonus: the ability to waste 7 power points in a suicide attempt and turn Vicki into Masamune (it’s a shame she can’t become Saiserka) to clear out some Frenzy Drake, Zeus, and similar creatures. Plus Lloyd, who Zwaain doesn't have – he's much less useful and almost useless without enhancement, but he has also won me games a couple of times.
It's quite amusing to compare these two cards in terms of usefulness in this way, as they are from the same pack and have the same rarity, yet Zwai is a meme, while HB is a useful, albeit slightly overpriced, spell that enhances Vicki much better.
tl;dr - until puppets become viable without artifacts (and they still aren't viable without them, and probably won't be for another six months or a year), it's better to use Magma to clear the board.