If you take a Pokemon on the Bench, you still get the point for the KO, allowing you to use Articuno to finish off weakened opponents, even if they retreat: while 10 damage isnt a lot, it will quickly rack up round-on-round, especially if they are already damaged
The repeatable space it plays into perfectly suits a grindy midrange metagame of a lot of casual games
The real driving force behind Agatha's favorite mixing bowl is the activated ability text, which is bound to excite Johnny/Jenny deckbuilder
1st Edition PSA 10s that once sold for roughly $50,000 surged to $420,000 at peak, and now trade in the $200,000$300,000 range
The [by far] most likely scenario of not ever even seeing the seven-drop (probably around half the time) is break even, as youre not getting punished or rewarded for putting it in your deck