Most of the time, the cheapest card prices will be from Spain or Italy (as they are in this case), which of course is fine if you're from those countries, but might mean that if you'll mail-order them, you'll have to pay more shipping or even toll costs than is reflected in the price numbers here
Now there may be times when the grabbing of lands is prohibitive, and winds up handing the game to your foe as they blow you out with a giant Secure the Wastes or cycled Decree of Justice that makes 17 dorks off the 9 new lands you gave them as they ran a deck that went wide with tokens
Long story short, there are tons of neat ideas and reasons why you might want to make your own cards
Pull rate from Regular Packs: 0.32% The estimated pull rate for Mega Charizard X ex (Mega Shine) from a Regular Pack is approximately 0.32%, meaning you might need to open around 313 Regular Packs to obtain it
From Battle for Zendikar to Ixalan, every block has had at least some nod to white/black draining life (Dominaria has repeatable life loss, but no W/B drain card)
If you play the Pokmon TCG, youll probably use it