Due to that uniqueness, coupled with Secret Lairs finite production, many of these are top-dollar cards that will likely not be seen anywhere except the drops in which they were originally found
Trade-in provides a way to discard all of the heavy blue-eyes monsters and sets them up for graveyard recovery cards like call of the haunted and Silvers Cry
destroy it, then the monster that was equipped with this card cannot change its battle position, also its ATK becomes 0
Black's strengths are destroying creatures, forcing opponents to discard cards, making players lose life, and returning creatures from graveyards
Expending four energy nets you your choice of any creature card back from the graveyard to your side of the battlefield
While it is restricted to once a turn, being able to cast creatures from your graveyard without having to pay any extra mana is powerful in a way that isn't obvious at first