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1 Traditional foil Doctor card 1 in 10 appear in surge foil

I dont think you should play Key to the Archive only for its spellbook, but its not hard to find a deck that wants to make use of two extra mana of any combination of colors (and here it being any combination is important, because it allows you to cast off-color gold cards like Putrefy and Lightning Helix)

THE BATTLE FOR ZENDIKAR As the Eldrazi ravaged Zendikar, many planeswalkers did indeed arrive to combat them

Vigilance is an excellent ability to have in a sizeable creature that will constantly grow in the right deck

Where else will you get an emblem that counts any creature dying