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
As long as one target remains legal, any legal targets won't be able to block this turn, any illegal targets won't be affected, and you'll discover 4
Or perhaps its because its so easy to make a ton of anime characters use Fiend decks
Yawgmoth's Will wasn't a Wall
However, it would be particularly powerful in decks that perform library manipulation or care about casting spells from anywhere other than your hand
Exact Words: When he's not having it lie, he has his AI tell only some of the effects of his cards in order to take advantage of his opponents never checking for themselves