The memes, the big plays, the nuanced synergies with both wide and tall boards its an absolute all-timer of a Magic card
As Goremand's triggered ability resolves, first the next opponent in turn order (or, if it's an opponent's turn, the opponent whose turn it is) chooses a creature they control, then each other opponent in turn order does the same knowing the choices made before them
Presumably the only thing stopping people from trying to hawk copies of the English version of the Mega Gengar ex is that they havent got an image of it yet
In these decks, Flood of Tears isn't just a mass bounce spell, it can even be a ramp spell, letting you pay six mana to "ramp" out a a haymaker like Void Winnower, Jin-Gitaxias, Core Augur, or Nicol Bolas, Planeswalker