It’s not the magic boost that’s the problem, IMHO; it’s that Stellarix sinks all the mana it generates: it will very often self-loop through its Elemental + Umbral Star gem creation. That’s the danger of giving it even one turn: once it has its turn it’s likely to loop on it until it’s wiped your team.
…and there’s the problem. That mana-cost change was sufficient to constrain the single-color cosmics, but it’s not sufficient to prevent Stellarix from self-looping.
Stellarix currently has a mana cost of 32; let’s compare to the next-highest mana costs:
- Daemon Gnome, mana cost 50: yeah, who cares, nobody ever uses this
- Enraged Kurandara, mana cost 35: higher than Stellarix, but it only uses 3 mana colors and it has only indirect mana gen in its spell via its doomskull creation
- Zuul’Goth, mana cost 32: same as Stellarix, uses only 3 mana colors, no mana gen
- Stellarix, mana cost 32: uses all 6 mana colors, generates all 6 colors
Stellarix has huge mana gen and can sink all the mana it generates; it should cost more to cast – maybe significantly more – than Zuul and EK.