Resilience to replace regenerate. Befitting undead, illusions, ice creatures.

Feels too similar to indestructible, to me.

I mean, unless you are playing black and can skip damage and go directly to kill; but don't exile - then it really is identical.

So why does black get that loophole?

Wait. Did you come up with that before or after I posted recently about indestructible as a potential blue-black evergreen mechanic?

I don't see a big benefit in switching around which of the two black major forms of removal works against this (-N/-N vs. destroy).

Indestructible has the benefit of a name that resonates well and clearly implies the mechanics.

Yes it was influenced by your post but also inspired by obsolete keywords like protection.

Indestructible is almost too good and oppressive. That's why it's not seen in large amounts.

Resilience tones down the power level, but also protects against effects that indestructible can't. More importantly is replacing several other defensive abilties that have been abandoned through the year, to balance out offense vs. defense.

Bit it is literally "Indestructible, except to black effects; they can hurt it"

Not quite. It's better vs black -X/-X and worse vs black/white "destroy" effects. Basically 100% of Wraths work against it rather than 10%. And a handful of weird colour-pie bleeds or breaks like Pongify, Beast Within, Fleshpulper Giant. This does seem far too similar to indestructible, even so.

(Also the power level here seems absurdly high compared with Darksteel Myr, but that's somewhat irrelevant in a discussion of the mechanic.)