Those five, plus the five locations, Simba, and Mauis Fish Hook make for a total of 12 cards that might be playable
A sets print run, while not being precisely calculable, naturally ties in with a sets rarity a couple different ways
Rosa, Resolute White Mage
Any cheap characters that can yield card advantage or ink advantage are high picks in my book
There are some reprintings for Lord Windgrace since the 2018 precon, but none of these cards are widely available, and therefore go for premiums
A flexible tool from Aetherdrift is Defend the Rider which gives extra protection when ward falls short, plus the instant can provide a pair of pilot tokens if needed