Tymna is a top commander choice because she has the Partner ability, which - like Tymna herself - was introduced in the Commander 2016 set
Pokmon today have higher HP than ever, but with damage increasing to compensate, the gameplay is still fairly similar to past sets -- the main difference being that old cards with lower HP and attack are no longer viable, unless they have an extremely powerful ability to make themselves relevant
As for what you'll have to choose from should you get the opportunity to buy items from The First Chapter re-release, there are a few items up for grabs for those of you in the US
"A launch that starts at a specific day and time tends to reward bots, people with fast internet connections, talented gaming fingers for quick F5/refresh reactions, and those who can schedule their life around that moment," Valve's FAQ reads
It stars the sleepy Pokemon laying by a river, with a Pidgey hanging out on its belly
Now that your cards are organized by set, you can insert these into your storage container to complete your organization