regigigas pokemon card Cards | Dex Weakness Fighting ×2 Resistance None None Retreat Cost Regigigas (37/146) [Diamond & Pearl:

The rest of the cards go on the bottom of your library in a random order

Next, annihilator is always hard for opponents to navigate and come out on top of

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Aatchik, Emerald Radian Imagine how big Aatchik, Emerald Radian must be for it to cost six mana

As such, unless there's a bunch of spicy things in graveyards that folks feel they can get their hands on (and they don't understand that you could just steal them out from under them with your copies that resolve first), I would expect most people to say no to letting you copy reanimation spells, and I think that they would be right to do so