Rarity, power, and demand from even current players have pushed Timetwister's price into the stratosphere, making early-edition cards still in good condition as expensive as some luxury cars
However, secretly, the card that stole my attention was Skyshroud Lookout
Rather than a static buff to their stats, it grows these creatures types with +1/+1 counters whenever you gain life, which is pretty big game because, by and large, most of these creature types tend to start rather small
Conversely, past a certain point, you cant take your foot off the gas to ramp or durdle, or you risk losing too much tempo
Similarly, Clandestine Chameleon will lose abilities as those stickers are removed or those permanents and/or cards go to zones other than the battlefield or graveyard