Of those three abilities, the first is best for draft if the player has enough Adventure cards and they don't mind delaying an Adventure creature finally entering the battlefield after two Adventures
A bunch of really cool new cards next to some amazing reprints, like Hullbreaker Horror and Mindcrank, one of my all-time fave cards
Doubling Season is one of the few cards of its type that can double the counters that are placed on planeswalkers, letting you use their final and often strongest abilities as soon as they come into play
The ETB effect only works on permanents that aren't two colors, while the effect on the artifact creature on the back face rewards you for playing two-color cards
Thats a card called Library of Alexandria, printed in 1994, Teddy Carfolitea South Carolina school teacher and avid Magic: The Gathering player told me
Then you are likely to attack into a free opponent