She needed the mana of the countryside, and disturbances in the ether were preventing her from making the necessary psychic bonds to any of those lands
They're Spell Speed 2, meaning you can Chain them to other cards, though some don't need to be Chained to anything
In other words, as long as Regidrago has 3 energies attached (the ones you need to declare its attack), you can choose any attack from any dragon in your discard pile
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This is a pretty powerful counter to cards that rely on high energy to go off, such as Raging Bolt ex
Horrifying body gore, impossible-to-detect infiltration schemes, and a (mostly) irreversible transformation into one of the most feared entities in Magic