Not sure if this'd get too irritating at common; it may end up getting moved to uncommon. There are a few ways to take this idea: you could instead regenerate for . But I like the idea of this bolted-on widget that automatically does it, although it has to reinitialise itself each upkeep, giving a little window for instant-speed destruction to work.

On the other hand, if this card doesn't even work against instant-speed artifact destruction, people may conclude it's just pointless and not play it.

I might change this to ": Regenerate connected artifact." There aren't any other connectors with abilities, but several care about whether they can successfully become tapped, which is close enough.

Playtest it first and see whether people bother using it.