With Jace, Vryns Prodigy you are potentially pulling ahead more than one card, can discard the awkward answer instead of having to cast it the first time, and are able to recast spells like Languish
And it's a solid attacker too, with its Lighting Rondo attack only requiring two Energies to use, and deals more damage based on the total number of Benched Pokemon
This can be particularly devastating if the opponent manages to special summon a monster on the player's turn
As often as you like during your turn (before your attack), you may take 1 Energy card attached to 1 of your Magnemites, Magnetons, or Dark Magnetons and attach it to a different 1 of your Magnemites, Magnetons, or Dark Magnetons
Check out Mayakashis chain of Synchro Summoning
When she is in play, enter the battlefield triggers from your opponent's permanents simply dont happen, while enter the battle triggers of your permanents happen twice