It is still incredibly appealing, both to collectors and to players, particularly as it will most likely become a very rare find in the future
Wolfwillow Haven makes Wolves, Woe Strider makes a Goat (for some reason), and Bastion of Remembrance makes Humans, the worst creature type of all
I can definitely understand people not putting Yawgmoth, Thran Physician in their top five list as its only played in one deck, which isnt a dominant player in the metagame either, but the card makes the archetype and there arent too many good mono-black creatures in Modern right now
Leader could've been a cool way to support Lorwyn tribal decks, but I imagine it would be hard to balance
What I mean by this is that every new Pokmon card pack that you purchase in real life comes with a code card that can be entered into the app to open a virtual pack of cards to be used in battle
And even if you already have a few cards in hand, playing Oak at the right time will almost always change the entire complexion of your game