Put any number of Dinosaur creature cards from among them onto the battlefield and the rest on the bottom of your library in a random order
Ten is way easier to count to than twenty
At the beginning of your second main phase, you draw X cards and lose X life, where X is the number of your opponents who were dealt combat damage by Estinien Varlineau or a Dragon this turn
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
That device enters the battlefield as a token that's a photocopy of the pictured creature