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
Feel free to add an experience counter each upkeep if Meren is in play as well, while your opponents reel under the stress of being mostly unable to cast anything
Being a ninja makes it useful in more than just illusion decks, and we like cards that can be used in more than one place
Not every Dragon works well with others, and some don't even share the same color types
Ultimately, I believe that this set will shake out similarly to Dragons Maze