Dual Lands Dual lands like Volcanic Island and Underground Sea are the backbone of competitive Magic and some of the most proxied cards in the game
This helps reduce the impact of discarding, provided that you plan your ink usage around it
But even if the Reserve List were done away with tomorrow, there are some cards out there that I absolutely feel would not be reprinted
Parun has the ability to deal 1 damage whenever you draw a card, which is excellent given the next ability draws you cards whenever anyone casts an instant or sorcery
Once we had Priest of Titania creatures, it seemed natural to have Priest of Titania spells: (Wirewood Pride, for example was called "Giant Growth of Titania" in design.) The one-shot spells then led to permanents that trigger a tribal effect: Its interesting to note that Elvish Guidance got created because we wanted to find some way to get the Priest of Titanias effect into the set
Not only does [c]Shadrix Silverquill[/c] have flying and double strike to tear down your opponents life total, it also lets you draw cards, create flying tokens, and buff your entire side with +1/+1 counters