In a Commander deck with K'rrik, Son of Yawgmoth at the lead, you can turn the black mana in your spells into Phyrexian mana, letting you pay two life instead of paying the cost
The holo sheet is notable in that it prints the card in set order and has no permutations of the sequence - unlike Team Rocket, the last known holo sheet
Rift is a uniquely powerful board clear effect that leaves the caster in an incredibly advantageous position (since he or she gets to keep everything and everybody else loses everything)
Game Designer: Play & Design, in response to my question about which decks and strategies Serra Paragon might best be suited to, would be to pair her with fetch lands: lands that sacrifice themselves to search your library for another land to put into play
These references aren't totally obscure, but I also picked ones that aren't such popular knowledge that even people who haven't played the games probably know about them, like Sephiroth killing Aerith