If they don't counter it, they're probably sitting on a bounce spell or the dreaded Cyclonic Rift
This is, if anything, the most fun portion, not least because it can be a far more social actvisiting card shows, rifling through cabinets in specialist stores, and meeting up with others at trading evenings
If Graven Lore is copied, no mana was spent to cast the copy, so you'll just draw three cards
Consider getting them authenticated
Dudunsparce An engine on its own, Dudunsparce has become an interesting choice for some decks, such as Gholdengo ex, to draw more cards every turn
Heres the main different art treatments that we can find in Tarkir: Dragonstorm