First up, a True Soul zealot, taken straight from the current Baldurs Gate 3
If a card refers to "your commander," it refers to both, although if it's trying to perform an action on your commander, like put it into your hand, you choose which one it's talking about
Its been quite a while since we had consecutive sets share a thematic and mechanical base like this, and I admire how WotC has used this chance to express the grindy, graveyard-driven nature of Innistrad in two different ways
The valuable cards tend to be the 14 Pokemon EX (2 of which are Mega EX), along with some of the more powerful energy, trainer, and item cards
There are a million different ways that you can take this, but each type being represented in full is important
Burning Shadows is seen largely as a Charizard chase