Well, I have a few recommendations
Knight of the White Orchid was the gold standard for white mana ramp for a long time, and it has only recently had challenges from cards like Loyal Warhound and Cartogropher's Hawk
While their strongest identity comes from Innistrad, where theyre all about flash and tempo and the like, most planes have a spirit or two
This is a great alternative to simply taking damage from your opponents attacker, since youd have lost the life anyway if you let something through
This artifact creature can see play in many different EDH decks, and theres a few synergies with pingers like Ob Nixilis, Captive Kingpin, even in Standard
As such, the easiest and simplest way to increase the desperately needed supply of Reserved List cards would be to reinstate the "foil loophole," which would allow Wizards to print an all-foil Reserved List Masters set