I think we can still play this in Standard, because hitting Siege Rhino is just that important
Of course, the 12th slot in a Set Booster pack is a guaranteed rare or mythic rare card, which is no different than the same slot found in Draft Boosters
It was a re-release of Alpha (the original Magic set) that was released after the first Alpha run was sold out
Etali, Primal Conqueror / Etali, Primal Sickness With a massive 7/7 body and a wild enters effect, Etali, Primal Conqueror is already a house: It casts a spell from each player's deck for free
There is another creature you can use to achieve similar ends but you'll need to replace Doubling Season as well
Hoarding Dragon Another dragon, you say