Pointed Discussion

And just what is wrong with Arenson's Aura's name that they need to reprint with a new one?

It has a simple and obvious reason, mrredhatter: That's because Halvor Arenson is not part of the story from Invasion block.
He apparently has a somewhat important role in Ice Age block, given that there are 15 cards in total that mention his name.

Yet i don't quite get why they didn't give this enchantment a buff by lowering casting or activation cost when given the opportunity to print a remake of it. Changing the power level of this card wouldn't have hurt, seriously.

Yup, I'd really like to trade my sigil of the empty throne for your oblivion ring. Didn't really need my win condition anyhow.

Or pay five mana to counter your pacifism.

Perhaps emulating a spell from the ice age block, well before the power creep existed, was not a wise move on Teferi's part.

Why yes I will sacrifice my Rancor to destroy your Asceticism.
Perhaps my Spirit Loop would be a fair exchange for your Debtor's Knell... but on second thought I'll destroy your stuff and keep my cards anyway.

The hard counter ability is kind of useless though...
And I suppose Enchanted Evening should get a nod on here too, as is the case for anything that allows you to repeatedly destroy enchantments.

This card feels very Pokemon TCG to me. (That means, the two parts feel kind of detached despite the similarity.)

As of this comment:
Teferi's Care is rated at 1.375/5.000
Arenson's Aura (Ice Age) is rated at 2.344/5.000
Arenson's Aura (Fifth Ed.) is rated at 2.278/5.000

That's ridiculous. Sure, there's different art and different flavor text, but...really?

Teferi's Care/Arenson's Aura isn't even a bad card. It's tech against enchantments, and it's breakable tech to boot! Brilliant Halo makes it read ": Destroy target enchantment." That seems pretty good to me, and Rancor makes it even cheaper. Add the much more recent Enchanted Evening, and Teferi's Care/Arenson's Aura let's you nuke any permanent.

Furthermore, the second ability is not to be dismissed too quickly. There are a lot of powerful enchantments out there, and any way of repeatedly countering them can be useful. The relatively high mana cost is probably not a problem in slower formats like EDH/Commander and casual play.

There are also times where the ability to counter is necessary. What if there's a Mycosynth Lattice on the board and someone casts March of the Machines? It might be useful to counter that rather than eat an Armageddon, and Teferi's Care/Arenson's Aura let's you do it without needing a Counterspell in your hand.

At its absolute worst, it's a sorcery costing that destroys an enchantment if it doesn't get Stifled (okay, that is really bad). But at its best, it can wreck an opposing combo deck or perform a one-sided board wipe.

This should be at least 2.5/5, if not 3/5.

Teferi must really hate enchantments.

@allmighty_abacus: "Yup, I'd really like to trade my sigil of the empty throne for your oblivion ring. Didn't really need my win condition anyhow... Or pay five mana to counter your pacifism."
Yeah, when you pick bad ideas, it makes the card sound bad. But how about I cast Oblivion Ring, put the ETB trigger on the stack to exile your Umezawa's Jitte, then sacrifice my O-ring to destroy your Sigil of the Empty Throne. And I'd pay 5 to counter your Debtors' Knell any day, espcially for no card.

Think about better things to do with cards and you won't think they're all bad.

Sideboard option, but you probably just want to sideboard Erase or something. It can sacrifice itself, and the hardcounter is far from useless. Great later on verse an enchantment deck. Repeatable counter is worth .

You could combo with rancor, and enchanted evening.