You may exile a nonland card from among them
Veil of Summer Banned in Pioneer for power level, Veil of Summer makes the player who cast it essentially invulnerable to blue and black interaction
This matters for effects that care about mana value (e.g., destroy target artifact with mana value 1 or less can hit Clues)
There will not be any bans for the rest of this year, save for something new that shows up and needs quick action, likeNadu
Since so many creatures and Planeswalkers immediately refund cards and mana if they resolve, countermagic is essentially the only clean answer
The reason we dont see more cards like this is that Wizards doesn't like mechanics that hate on a particular color very much, so were unlikely to see many more landwalk creatures because its difficult to flavorfully depict a creature that can walk across plains particularly well