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This gives you a little extra value for the initial spell, and Rinoa specifically also has an ability that works better the more creatures you have

And for Mega there is a Shiny Mega Gengar and Gyarados (even though Gyarados doesnt have a regular Mega variation, only Shiny versions are available in the TCG)

A stack of pulls, a binder, or a garage-sale lot

Doing so puts a monster Special Summoned from the Extra Deck on the field, enabling Dogmatika Ecclesia, the Virtuous to be Special Summoned from hand

What makes it especially good in a Zombie deck, aside from the fact that most Zombies are Black Creatures, is that you can probably recur it with ease