Playing The Fourth Doctor, as portrayed by Tom Baker, will allow the player to look at the top card of their library whenever they like, as well as active the Would you Like A...? ability a reference to this Doctors love of Jelly Babies which enables the player to, once per turn, play a historic land or cast a historic spell from the top of their library
you can't cast it without discarding a card, and you can't discard additional cards
Woody Waiting for a Friend on turn one lets you play Bullseye Loyal Horse on turn two
So its no surprise that Robin Hood, Champion of Sherwood is relatively expensive even as a non-Enchanted card
Instead, my money goes to the Trumpeter (check him out in the International Cards section of this list)
Sunset Saboteur This card is kind of unreal on rate