Cumulative Upkeep was a mechanic used from 1995 to 1997, though it was brought back for Coldsnap for the sake of continuity with Ice Age, which was the first set to use the mechanic
Sai, Master Thopterist and Thopter Spy Network are staples of artifact decks, while Shorikai, Genesis Engine and Valor's Flagship can give you Pilot tokens
Note the converted mana costs of your key cards
Magic: The Gathering fans have been demanding a Parallel Lives reprint for years
If you pay two generic mana when tapping Three Tree City, you can generate a ton of mana for any color equal to the number of creatures you control that are a certain type
Of course, there are MDFC lands like Spikefield Hazard and some types of cards that count as both a spell or a land