Slash does 60 damage for three energies and Crimson Storm does 200 damage for four energy
The man lands are great mass removal protection, a great way to use spare mana as you approach the midgame and provide a lot of general utility for the deck
For now, though, this is the new Rainbow Rare format and it looks quite nice
These cards are iconic because they do totally unfair things like giving you a huge burst of mana or massive card advantage way faster than anything else
As Timothy Zaccagnino said when I asked for his opinion about this topic, I think the onus is partly on the player to say to themselves that they don't need everything that comes out, and I find it interesting and exciting that people can play cards against me in 2023 that I'd never seen before
Like any new mechanic, Pokemon ex are likely going to start off as mainly mid cards and get better with each new set release in that era