I realize that nobody plays Serra Angel anymore, but for those new to the game, you'll have to take my word that she was quite the beater back in "the day." Each of the cards will be listed in descending order, from number fifty to glorious number one
This morning I played against a deck that seemed to consist of just two Articuno EX cards and no other Pokmon, but the sheer amount of healing power - with two Giant Capes, Potions, and now two Iridas all in the deck, as well as Misty to pile on the energy fast with a bit of luck - meant actually getting through just these two Pokmon became almost impossible
If a card(s) in your opponent's Spell & Trap Zone is destroyed and sent to the GY, while this card is in your GY (except during the Damage Step): You can Special Summon this card in Defense Position
It often happens that the lower rank is secured and it is messed up
Oh, and keep in mind that Backup transfers all abilities below it
Secondly, Gwen provides a 300 attack boost (which can often make a difference) and a bonus effect based on the attribute of the equipped monster