As a control player this has limited value
So, having these cards legal would make it so no one would want to play for ante (especially considering the average price of a Vintage deck), meaning these cards would basically let you play a smaller deck since they would get removed and make you more likely to see your key cards
After all, they are all 6-mana 6/6 flyers with upside something that was unheard of in 2000
You make room for four Erases in your sideboard to make sure that you don't have a repeat loss to the Outpost Siege
You know, a perfectly reasonable reaction to something entirely chance-based
Entering the battlefield with four loyalty, this Ajani's +2 is solid, netting you up to three additional cards in your hands while filtering out unwanted land, while its -2 functions as exile-based removal