There are a number of cards you can't use in Explorer: Expressive Iteration Field of the Dead Geological Appraiser Karn, the Great Creator Kethis, the Hidden Hand Leyline of Abundance Lurrus of the Dream-Den Nexus of Fate Oko, Thief of Crowns Once Upon a Time Teferi, Time Raveler Tibalt's Trickery Underworld Breach Uro, Titan of Nature's Wrath Veil of Summer Wilderness Reclamation Winota, Joiner of Forces MTG Alchemy banlist Alchemy is another digital format for MTG Arena, which is based on the Standard card pool
High risk in that getting it killed results in no extra cards and not getting it killed might result in your taking too much damage
But the above subtlety has nothing to do with the source of the draw effect
So that's your Myrs getting turned into something, and all your Treasure or Clue tokens also swapping forms to something new
Faclier, Agent Provacateur and Mickey Mouse, Wayward Sorcerer in your hand, respectively
Curse of Shaken Faith is a card that might actually matter