It suddenly capped off the cycle of Guildgates with an alternate win condition that demanded you play five colors (or close to it)
This was also the case for Celes, Rune Knight, previewed last week on her in-universe birthday, March 10th
Along similar lines, the card is definitely worse in sideboarded games where most decks are more likely to draw that key piece of interaction, and the more copies of Unsubstantiate you play, the harder it is to sideboard them out when you decide theyre bad against your opponents post-sideboard configuration
So, what do you think of my analysis
And Mental Misstep is the ultimate tempo card, countering key 1-drops like Sol Ring, Mystic Remora, or Vampiric Tutor before your opponent can even get going
84 points