Field spells back in 2004 meant a card that would give monsters of a particular type a boost (and in the anime it changed the battlefield into an awesome battleground, but sadly this is not the case IRL)
In the anime, its equipped to Pegasus Illusionist Faceless Mage and, after attacking Dark Magician, takes control of the creature the following standby phase
You can only use each effect of "Tri-Brigade Kitt" once per turn
Masquerade can also Special Summon itself from the graveyard as long as your opponent has a Fusion, Synchro, Xyz, or Link Monster
But I always collect for the purpose of playing with the cards I gather
Adding a Warrior toolbox to GC gives the deck a way to generate pluses through combat as opposed to the older versions of GC that leaned on older, metamorphosis-dependent cards like Magical Merchant