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After that its really up to you

However, a single extra card you have to jump through serious hoops to get is philosophically okay in the same way that a tiny number of cards (like Relentless Rats) are able to violate the even-more-important singleton rule

We now have synchro monsters, XYZ monsters, pendulum monsters and link monsters that can all utilize the extra deck and all of a sudden, having a good extra deck makes the difference between winning and losing

If your Serra Paragon sticks around for a few turns later in the game, you get to recycle creatures your opponent has already dealt with, either forcing them to remove that creature again or waiting to get overwhelmed by your returning forces

Then this comes out and makes a Volcasaurus while recovering your Legionary -This + face-up Legionary = Barcha How effective will the deck build be

Cast it on a later turn for its foretell cost.) Instant Great Train Heist Spree (Choose one or more additional costs.) + Untap all creatures you control