The decision to print Reserved List cards like Mox Diamond, Masticore, Karn the Silver Golem and Phyrexian Negator in foil (therefore making them "premium" and not bound by the Reserved List) was met with almost universal criticism, resulting in the decision to ban Reserved List cards from ever being printed in any playable product
Some great support cards for flipping coins are Chance Encounter, Fiery Gambit, Tavern Scoundrel, and Krark's Thumb
I'd talked over the options with Steve Sadin, and this was one option that neither of us had even thought of, let alone considered
All the shocks are hovering around $7-10 for the time being, and every time these get reprinted they end up settling in around the same order
Even outside of graveyard strategies, cards get removed from play all the time in Commander