Summons of Saruman is amazing since it essentially works with all themes of the deck: amass orcs, fill your own graveyard, then cast another instant or sorcery for free
They also had a good selection of Pokmon and other trading cards as well as a couple shelves of board/card games
Instead of paying the Ink cost, players can choose to exert a character to sing the Song for free
The pain lands are about as classic as card design comes
If a card is a first edition, rare, and has a high grade, it is worth more
Now, the Phyrexians are back with a new ability, Toxic, that serves a similar purpose, and the community aren't happy to see poison counters back in the game