MTG Forge lets you play sealed or draft. The fun thing with all of this is that you can change the rarity of cards. Want a common Stuffy Doll, no problem. It was fun adding Savannah Lions and Isamaru, Hound of Konda to the common file, trying to push the white weenie idea. Oddly enough it didn’t unbalance the environment. Usually Savannah Lions or Isamaru, Hound of Konda traded with a generic 2/2. Sometimes you started out behind if you were lacking on mana or creatures and your opponent played his great 2 power creature for W, but overall it didn’t really matter. Anyways, it is great seeing powerful creatures that were rare, bumped down to a lowly common. Maybe I’ll make Ancestral Recall common next, who knows.
The file that contains all of the common cards is named “common.txt”. If you want to add/subtract a card, just add it to that file. To change the rarity of a card, move it from “uncommon.txt” to “rare.txt” or just delete it, if it isn’t any fun to play with