My favorite is Blightsteel Colossus plus Chandra's Ignition, which is sure to get you uninvited from the next EDH night
If you're looking for a different shopping platform, try Troll and Toad, Gamenerdz or Cool Stuff Inc
Here are a few more guidelines to use as a starting point: For a 40-card deck, if you really want to have a land that produces a certain color of mana in your opening hand, you should play at least ten lands that produce that color (eleven or twelve to be safe)
Gold & Silver SP There are four sets of Gold and Silver variants to chase : OP11 (Monkey D
Magic Beta card list & price guide
When it attacks, sacrifice it at end of combat.) Artifact Ramp (CTRL to add secondary) Recursion Emperor of Bones At the beginning of combat on your turn, exile up to one target card from a graveyard