Is it Worth It? MAA Limited Edition Sale

Marvel Avengers Alliance is currently running a 3 day sale featuring three past items for a limited time. One of them the Phoenix Flare costs 64 Gold, but the other two, Cosmic Flame and Arc Reactor Charge, are offered at a discounted 48 Gold each.

However only one of them is worth looking at buying...

It's the Cosmic Flame. With a fairly short cooldown (2 rounds), if used properly, it lets you remove all buffs from the opposing team every other turn when paired with an AOE weapon/ability like, say, the Dark Sigil or Dr. Strange's Vapors of Valtorr.

I wouldn't say it's a must have, but it's very useful in certain combinations. The small regen is just a bonus. Of course, you still might get it for free as a drop for defeating Red Skull.

The Phoenix Flare might look nice for its stealth high damage AOE and small regen, but it also costs you a turn  while there are better damage dealing weapons out there.

The Arc Reactor is probably the worst of the bunch. You basically sacrifice the next turn for this turn.