It requires a great deal of setup to be really useful
Once per turn, when this card declares an attack: You can look at your opponent's Extra Deck and equip 1 monster from it to this card
Like most Magic: The Gathering cards, the value of Myriad Landscape depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Tales of Middle-earth Commander)
Pokmon usually take damage from being attacked by your opponent's Pokmon, but they might also suffer damage from the Poisoned status, or even from their own attack
Flower Cardian Lightflare X DARK Level 10 [ WarriorSynchroEffect ] ATK 5000 DEF 0 1 Tuner + 4 non-Tuner monsters Once per turn, during either player's turn, when your opponent activates a Spell/Trap Card: You can negate the activation, and if you do, destroy that card
It's not good ramp, but getting the option to fetch a Plains every turn seems desirable, especially in mono-white and Boros