You may play those cards until your next end step
Otherwise, your ability to get enough tickets for any higher end prizes is a complicated venture for the on-demand side events
Doubling Season doubles the number of counters, so you'll put two lore counters rather than one
To determine the total cost of a spell, start with the mana cost or alternative cost you're paying (such as a flashback cost), add any cost increases (such as kicker costs), then apply any cost reductions (such as that of Cid's first ability)
I think EOE will have some brutal undercutting going on, but I cant say for sure what the price levels will end up at
Australia and New Zealand had a sped-up release schedule where the first four sets were released with six-week gaps, then the last two sets got released in line with the rest of the world