In the absence of cards like [casthaven]Stifle[/casthaven], [casthaven]Wasteland[/casthaven], [casthaven]Force of Will[/casthaven], and dedicated hosers, I have no idea how Modern decks can fight them, other than by playing a version of Eldrazi designed to break the mirror (or perhaps [casthaven]Painters Servant[/casthaven] is a stronger hoser than it appears)
Typically, these cards simply have the yellow border of a Pokmon card with a blank white interior
Both of these could be very valuable, although Moss Agate still relies on three different energy types to work
Old legends stir the winds as monsters roam the earth
Thanks for reading, and have fun with Dihada out there
This extremely potent mana reduction can allow you to start double or even triple-spelling much earlier in the game, and push your opponents to keep up with you or lose