For Master Duel format, I would advise something around 0.62 - 0.70, the reason being that Master Duel decks have the "N/R/SR/UR" tags on the cards, which throws off object detection to some significant extent, so you'll need to compensating by reducing the accuracy coefficient threshold
We wanted to evoke the feeling of a detective searching forclues among the Whispers in the deep, and the artwork for the set really brings that to life! Elaine Chase, Head of the Disney Lorcana studio at Ravensburger, added: Whispers in the Well is a wonderful addition to the game that follows up from the success of Fabled and sets up the next arc of storytelling for Disney Lorcana TCG
The card is basically all-powerful, and Yugi was only able to beat it through wild logic leaps, which included his monsters bouncing their attacks off of one another in order to power each other up
This archetype often has enough draw payoffs to make them worth 3 or 4 mana
You can also get more benefits along the way, which offsets the fact that your creature will be gone in a few turns
This increases both its overall damage and the chance to successfully flip that coin