With perfect hindsight, I think it taps into something much deeper
Given the low cost and the trigger for a +1/+1 counter being quite generous, this has all the makings of a very dangerous early-game card that could contribute to quite a few quick wins if your opponent can't deal with it and remove it from the battlefield within one or two turns.
A Dion, Bahamut's Dominant Commander deck is a Knight Typal deck, meaning it's a deck that focuses primarily on one creature type, in this case, Knights
If you do, each opponent loses 1 life and you gain that much life.) Illustrated by Slawomir Maniak Standard Not Legal Alchemy Not Legal Pioneer Legal Historic Not Legal Modern Legal Brawl Not Legal Legacy Legal Comp
Its so much of one, in fact, that, in hindsight, were staggered that this card wasnt expensive during pre-sale