My problem with the Mana Vortex nerf is how itās a trap. Just because itās a 0 cost spell does not mean it does not have a resource attached to it. Itās now cleverly disguised card disadvantage. Reducing the cost of your next spell does not do you many favors unless your next spell has an extreme impact and is being played ahead of the mana curve.
I would prefer to see it changed to still provide some additional effect at an increased cost.
Maybe something like:
1 cost
Spells you play this turn cost 1 less
- Allows for dumping/comboing more spells from your hand late game if you can keep cards in your hand
3 cost
Give a friendly minion āWhen you replace a card, your next spell you cast this turn costs one 1 lessā
- Gives potentially long term benefits while keeping a restriction on how many times this effect can be used in a turn.



AD is a +1 with 2 minions active, and scales up from there. HE is a +2 and one of the spells can be replaced for a minion. Koan is what it is. Not to mention that Xho and Fox generate lots of cards on their own.