Alhammarret, High Arbiter Arbiter of the Ideal Argent Sphinx Arjun, the Shifting Flame Atemsis, All-Seeing Cerulean Sphinx Chancellor of the Spires Conundrum Sphinx Curator of Destinies Curator of Mysteries Dazzling Sphinx Defiler of Dreams Dream Trawler Eligeth, Crossroads Augur Enigma Sphinx Enigma Thief Glyph Keeper Goliath Sphinx Guardian of Tazeem Isperia the Inscrutable Magister Sphinx Master of Predicaments Master of Winds Ormos, Archive Keeper Petra Sphinx Prognostic Sphinx Riddlemaster Sphinx Scholar of the Lost Trove Serra Sphinx Serum Sovereign Sharding Sphinx Sharuum the Hegemon Sphinx Mindbreaker Sphinx Summoner Sphinx of Foresight Sphinx of Jwar Isle Sphinx of Lost Truths Sphinx of Magosi Sphinx of Uthuun Sphinx of the Chimes Sphinx of the Revelation Stoic Sphinx Vexing Sphinx Watcher of Hours Windreader Sphinx Yennett, Cryptic Sovereign

There are many different ways (formats) to play M:tG that have different rules for how to construct your deck and what sets you can use cards from
There is a bit to track with the wide range of counters you might use, but some colored dice do nicely to differentiate the counters
The card pool is already large enough that you can easily find 20 high-impact cards to include, and Yorions ability is worth making the room for
The effect of Moonlit Meditation's last ability applies before anything that modifies how those tokens enter the battlefield
Some of these types of spells only let you choose one option, some you can choose a few options, and others let you choose as many options as youd like