An Extra Monster Zone is not a part of either player's field until they Summon a monster to the Extra Monster Zone, meaning they are shared between the players
Though Colorless could technically be seen to be a Basic Energy and it is, after all, a Pokemon type in and of itself (representing the video games Normal, Flying and Dragon type Pokemon) there are only Special Colorless Energy cards, not Basic
If a creature is already suspected, suspecting it again won't have any effect
In order to trigger Sefris on everyone's turn we're looters like Vohar, Vodalian Desecrator, cycling like Angel of the Ruins, sacrificers like Demon's Disciple, and grave-swapping with Tortured Existence
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Not to mention Crown Opal allows you to prevent incoming damage during your opponent's next turn if there attacking with a Basic non Colourless Pokemon