HP copies have sold for as little as $349 and as much as $450 in 2024, leaving plenty of room for price shifts based on the condition of the card you're considering
Lightning Bolt is perhaps the most striking inclusion due to its mix of history - it has been present in Magic: The Gathering since the game's very first set - and tournament viability, where it regularly features into decks in each format it is legal in
If I can get the same quality cards in Korean or French for a fraction of the cost it would be ideal
The first choice for building a Commander deck is generally the commander, this is where your color identity comes from, and you add both partner commanders together to get the color identity
Living Plane, for example, allows both players to turn all their lands into 1/1 creatures, represented by this forest coming alive and strangling a poor man
The flashback part is likely to get you running through iterations with some kind of combo or storm deck, which you wont have to worry about anyone disrupting