Demolition Field is essentially the same card in 1v1, but doesn't ramp your other opponents in multiplayer like Field of Ruin does
To activate this spell, youll need to destroy one of your cards
In other colours that might be a bit infrequent but green gets to six often and at good pace
Plus, it makes your deathtouchers lethal to any planeswalker, as they should be
The cards you get can definitely go into other decks as you build your collection and with the vairety of cards there, they are good placeholders until you build a better and stronger collection
its ATK becomes equal to the combined original ATK of all "Ghostrick" monsters currently on the field, until the end of your opponent's next turn, but if it does, only that monster can attack this turn