Four is steep in Legacy and Vintage, and doubly so when its four specific mana pips
I would heartily recommend the experience to anyone, and particularly those players who might be feeling a bit burned out on regular games of Commander. Archenemy is a great format for this set it works well thematically, its creepy and groan-inducing (when the Archenemy plays a particularly mean card) and the artwork on the cards contributes to that all-important squeamish, uncomfortable vibe
As previously mentioned, mono-blue and mono-red have virtually zero cards which gain life (in the case of red, actually zero)
It's such a storied card at this point, and it's one of several older Pokmon cards that sometimes sell for wondrous sums of money
The counter effect, combined with other permanents that give stat boosts, can make your Birds into terrifying threats in combat
It grows with every creature you cast, and domes opponents every time you cast a high mana value threat