You'd only be able to tell a card was Short Printed by comparing mass data on that individual card from different boosters
Gix, Yawgmoth Praetor (Future Sight) from Mystery Booster 2 is trading around $103.58 on the secondary market
If Bound ripples, and you find another copy of Bound and Determined, you cant use that trigger to cast the Determined side because its considered to have a different name than the spell you cast
Cards with a low population, have a better chance of exploding in value later on
Ramping from five lands to seven lands is also pretty decent, especially if doing so is going to trigger your landfall abilities in the process
A card that looked mid-value last week can spike after a creator features it, after a new set announcement, or after a new record sale on eBay