It also counts as a Synchro Summon, allowing you to utilize that cards effects even though you cheesed it out
Battle for Baldur's Gate's Backgrounds are clearly modelled after Magic: The Gathering's Partner mechanic, letting you place multiple cards in your command zone
Protective Sleeves : Especially useful for trading cards to prevent scratches and wear
The Shadowless distinction is critical
It works really well for, say, Dark Magician Girl the Dragon Knight, but at the same time, there are a lot of combos that this card doesn't get to fulfill due to its Dragon (non-Spellcaster) type - namely, Magical Exemplar combos
Besides the original effects of the Seal, once per turn, the player gains 500 life points for each monster that they have on the field