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Counterspells tend to get much better if they have more utility beyond just countering a spell, and Mana Drain does quite a bit more most of the time

Cherens Care [Brilliant Stars] adds a great layer of depth by giving your Arceus VSTAR an option to pseudo-heal and get out of play

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His synergy with fetchlands and legendary lands alone is worth noting, but hes got plenty of other tricks to play with Stoneforge Mystic and such

Being able to swing turn 1 going first easily makes this better than Manaphy

The possibility of playing creatures in the sideboard, such as Guardian Beast, Juzam Djinn, or Serendib Efreet can always be enticing, as an option to give you an alternative avenue of attack after the opponent has theoretically sideboarded out most or all of their creature removal