Most formats let you play just four copies of a card (or just one in EDH) but you can instead put nine Nazgul in your deck, one for each of the different artworks
Gandalf the White just asked Elesh Norn, Mother of Machines to hold his Green Dragon Ale
If not, you sit and draw ramp, and more ramp, and struggle to draw enough Dragons
Deathrite Shaman Deathrite Shaman first appeared in Return to Ravnica and was a minor player in Standard, but did so much damage to specific archetypes that it was eventually banned in Modern
Knowing the difference can save you from wasting money on counterfeits or missing out on a genuine collectible hiding in plain sight
With terrific art and strong attacks, Zapdos was a prime pull back in the day