A member of the former Commander rules committee dubbed them legal, but only for the person whose name is on the card - meaning that, as soon as they're sold, they go from functional playing pieces to pure collector's items
This card tends to see play in decks that generate a lot of tokens because they can station the turn they come into play and later potentialize this land, or in decks that can easily cheat a big creature into play
Magic players love few things better than drawing an extra card, especially when it doesnt cost them a resource, so I expect youll find yourself safe from attacks from at least one opponent each turn
After the first wave of popularity in the late 90s, the market cooled dramatically in the early 2000s
As if that somehow still wasnt enough, both Altar of the Brood and Brain Freeze sell for around the $8 $9 mark
JSTOR 117047