There's just a lot of ways to attack this kind of deck, even through the maindeck, and these five options are just designed to get the creative energies flowing
Shocklands were cemented as a Ravnica thing (ironically, since they were given plane-agnostic names to make them easily reprintable outside Ravnican contexts) and the post-aughts Commander boom meant players were excited for a new round of guild legends
Finally, six mana may be a lot, but the mana cost is actually a strength
And, of course, you also get to ramp and fix your mana with the first ability
How many cards are there that trigger when your opponents play cards
If you have your commander on the field, it also helps to reduce the price of this card, making it a good pick for the format