Kingdom: Baker, Great Hall, Watchtower, Squire; Shelters
Solution: t1: Spend a coin token. Buy a Great Hall, and trash Hovel.
t2: Buy Watchtower.
t3/t4: If you draw Watchtower with two Coppers, buy a Squire and trash it for a Familiar. If you draw Watchtower without two Coppers, then you must have Great Hall in hand; play it to draw your second Copper. If you draw Great Hall without Watchtower, then play it.
Edit: Hey, you all changed the number of turns while I wasn't looking! Well, at least my solution works for any opening split, and not just 2/5.