mtg card explained Effects Guide : r/mtg Card - MTG Wiki

Counters doublers like Doubling Season work exactly the same with lore counters as with any other type of counter: You put twice as many as you'd have otherwise put

Each Set Booster contains 12 Magic cards, 1 Art Card, and 1 token/ad card, Helper card, or card from The List (a special card from Magic's historyfound in 25% of packs)

Of course, it does have the big drawback of letting your opponent draw 2, but situationally this isnt the worst see Prince Johns Mirror below

This commander is a free storm trigger, a free way to get cards like Mox Amber online, and a way to give players protection with cards like Fierce Guardianship