While it is trivial to get twenty or more creatures on the battlefield, if you have that many creatures, you can probably just win with those creatures
If a Mount becomes some other creature type, it will still have saddle, and non-Mounts can gain saddle if effects allow them to do so
Eluge, the Shoreless Sea (BLB) $28.31 Cards that do funny things with lands are often popular in EDH, especially if its not land-hate, which is generally frowned upon
Discount automatically applied when you check out with 4 decks
Eternal Central or "EC Rules" allows cards from the original sets as well as Revised, Chronicles, Fallen Empires, the Collectors Editions, and any reprint which uses the same frame and art the the original sets
Piru, the Volatile With Piru, the Volatile around, you can opt to pay the mana and keep a 7/7 flying and lifelink dragon around, or let it die to deal 7 damage to each nonlegendary creature