[...] this does heavily reward players who have quanta.
Which looks fine for a light card.
Sounds good, but the reasoning doesn't validate the lower HP, just that the ATK should be higher and/or the ability cheaper or more powerful. The HP should at least stay the same for the purpose of balance, even if it does do more damage (such as with Archangel). For example, if Mind Flayer had more HP than its upgrade but its upgrade had more ATK, I would always use the unupgraded Mind Flayer for the extra odds of it surviving to Lobotomize another day. I feel like upgraded cards are supposed to be more powerful with regards to their function, not just in general. 2
The comparison with with Mind Flayer | Ulitharid is adequate (duo card, lobotomy, low cost). The thing is that Ulitharid cost 3
whereas Mind Flayer 2
rendering the upped version slower than the unupped. I personally never use ulitharid (only Mind Flayer) as a lobotomy one turn earlier is more important than 1HP (particularly below 4). I wanted to avoid this paradox with this card and still play on the stats for the upgrade. I wanted that both card keep the same cost. Few creature have two attacks more upped than unupped (and they generally cost 1 more quanta - see GotP).
When the zealot Idea came to me I thought it might do. 2 or 3 HP makes extremely few difference against classical CC spells. It only has an impact against poison and aggressive shields (fire and skull shield/buckler as well as thorn carapace). Moreover, most of the
/
duos also contain blessing. With this card, the Zealot turns into a nice midrange attacker for light: 7|5 with a quite powerful ability. Making it countered by lightning then had sense.
However, if more people think like you do, I might revise my thought. Let see what they say ...