When your opponent activates a Trap Card while you control no monsters (Quick Effect): You can Special Summon both this card from your hand and 1 "PSY-Frame Driver" from your hand, Deck, or GY, and if you do, negate that activation, and if you do that, destroy that Trap Card
This game was only released in Japan back in 2001, so it is unlikely that many players even knew about this Angel before the Secret Lair finally printed it as a physical card
Another weakness is that Bilbo does not target conditions bourne by a companion
The ability for Omega to pretty much take enemy cards out of the game might be the reason it sees play, even with its expensive summoning cost
After placing it on the field, attaching a Fury Mokemoke or a Necklace to the Highest Level will give it high-level attack power, and since it is faster to collect in large quantities than other regular monsters, there is enough room to differentiate it