Its a great, cheap combo enabler that goes infinite with plenty of cards while being a respectable threat in decks that spread +1/+1 counters about
I think its pretty clear which category Ancestral Recall belongs in
Each creature that enters the battlefield under your opponents control, from Rogue Refiners to Thopter tokens, will represent a two-point life swing, which can really add up over the course of the game, making this two-mana investment a critical card against the current best deck in the format
New Cards The sad truth about new cards from Commander decks is that they are very rarely worth much of anything
Until end of turn, whenever a creature you control dies, exile the top card of your library
Organizers would no longer gain much revenue from selling table space to vendors, and the WotC budget for these events would probably result in fewer tournaments for lower prizes