Land Tax hasnt seen a reprint since 4th Edition, isnt on the Reserved List and fits the bill on the nostalgia front, so it seems like a solid pick for the other white slot as a super powerful card that many players wouldnt necessarily already own a copy of and services the EDH market
While it does go in there, it is much more than that as it also works with non-creature spells
That's another exciting part of this collection: not only is every single card signed, almost all of them are illustrated, with "recreation" artwork by the original illustrator
In this case, its ubiquity is a direct measure of its power in that format
cards to either play mid-cost Characters or give them to your Leader to set up his double attack, making it an excellent finisher
in your manabase, you can see lands like this more often