Two-color decks that dont have access to much ramp and can afford a few colorless mana sources can make good use of a Myriad Landscape, whereas green decks and 5-color commanders have much less need for something like this
- and punishes players for scrying, surveilling, or searching their libraries
However, when theyre attacking, only one Creature can block them, which makes it very easy to always win in every fight you get into
There are lots of ways to deal two, and a lot of creature choices will be made to try to avoid this weakness
(As a side note, it's useful to know that this is actually the earliest possible time in a turn that any player can do anything
While all new players desperately want to play every card that they own, experience is a harsh teacher and experience says that you don't get to play that many cards in a regular deck and have it get better