Creature Artifact - Robot Color tag templates(None) ED-E, Lonesome Eyebot Flying ED-E My Love Whenever you attack, if the number of attacking creatures is greater than the number of quest counters on ED-E, put a quest counter on it
Like most other cards on this list, the degree of error here is what defines the worth of your card (also if it has that big orange lizard on it, it's probably worth a few cents regardless).
The same is true for Greven, Predator Captain, just in a slightly more direct way
But since double-faced cards are put onto the battlefield with their front face up, we get an Elbrus, the Binding Blade with a +1/+1 counter which doesnt do much until Elbrus transforms into Withengar Unbound again
Some Magic: The Gathering cards hold value very well, while others fluctuate heavily