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Green Sun's Zenith It's hard to know if Green Sun's Zenith or Worldly Tutor should take the spot of best green tutor card - both are fab

First Place Mishras Bauble Andrea Piemonti I love this card for its complexity, and its design and synergy with other cards

Ragavan, Nimble Pilferer is so strong that it had to be banned in Legacy, currently terrorizes Modern as part of Boros Energy, and it's very often seen as part of the 99 of top-tier cEDH decks

I think the fact that Inquisition of Kozilek is more limited in scope this way definitely makes the card more interesting, but its universal enough that it helps alleviate Moderns historical issues around having too many narrow disruptions spells

Casting costs matter

Ive also heard of people including their custom designed cards in Cube, which sounds like one of the best places for it