The format at the time, which favored decks built around Basic Pokmon, had no place for it
Monsters that battle this Fusion Dragon have their attack points reduced to 0 at the end of the Damage Step, then you Special Summon a Dark Soul Token. These Zombie-type tokens gain attack points equal to that of the Monster you battled before summoning them and they most certainly can destroy Monsters
It doesnt take a veteran to understand how much value there is in a card like this, and I dont think its too much to say that resolving Beledros can absolutely win you the game
Theyre perfect for kitchen table Magic, but anywhere outside of your own playgroup is either a straight up no or a probably not. Its always best to check and make sure first in any case, but anything competitive or even vaguely non-casual is a heavy almost definitely not. Proxies arent legal in MTG in sanctioned Magic events, and depending on how theyre made, they sometimes skirt the line of legal in general
Mid Game "OP11-010 Hibari" is an attacker with an [On Play] effect that lowers the power of an opponent's Character to set up the perfect attack