What everyone else said is right -- you have to have the name, mana cost, and P/T (if it's a creature) visible
Modern Staples Following the collection of legendary Creatures suited for Commander, we have a handful of Constructed staples
Theres a smattering of other random staples thrown in here too, like Mana Drain, Swords to Plowshares, and Necropotence
Uncommon 135 Peter Pans Dagger Common 164 Launch Uncommon Pinocchio 36 Blue Fairy, Rewarding Good Deeds Uncommon 44 Jiminy Cricket, Pinocchios Conscience Common 56 Pinocchio, Star Attraction Rare 57 Pinocchio, On the Run Uncommon 58 Pinocchio, Talkative Puppet Uncommon 109 Honest John, Not That Honest Rare The Princess and the Frog 7 Eudora, Accomplished Seamstress Common 38 Dr
Its hard to recover if your opponent plays two of these
Sadly, the price point alone means that itll probably never see much EDH play