Cosmogrand Zenith's ability will count any spells you've cast this turn, which may include Cosmogrand Zenith itself
It lets you cast the card from the graveyard at any time you could normally play that spell
For five mana you get a tapped mana rock that you take a turn off from, then it taps for five mana, so it's the rare mana rock that taps for the same mana as that making it

As of today, this brings us to the following for the complete Game Changers list: Drannith Magistrate Enlightened Tutor Humility Serra's Sanctum Smothering Tithe Teferi's Protection Consecrated Sphinx Cyclonic Rift Expropriate Force of Will Fierce Guardianship Gifts Ungiven Intuition Jin-Gitaxias, Core Augur Mystical Tutor Narset, Parter of Veils Rhystic Study Sway of the Stars Thassa's Oracle Urza, Lord High Artificer Bolas's Citadel Braids, Cabal Minion Demonic Tutor Imperial Seal Necropotence Opposition Agent Orcish Bowmasters Tergrid, God of Fright Vampiric Tutor Ad Nauseam Deflecting Swat Gamble Jeska's Will Underworld Breach Crop Rotation Food Chain Gaea's Cradle Natural Order Seedborn Muse Survival of the Fittest Vorinclex, Voice of Hunger Worldly Tutor Aura Shards Coalition Victory Grand Arbiter Augustin IV Kinnan, Bonder Prodigy Yuriko, the Tiger's Shadow Notion Thief Winota, Joiner of Forces Ancient Tomb Chrome Mox Field of the Dead Glacial Chasm Grim Monolith Lion's Eye Diamond Mana Vault Mishra's Workshop Mox Diamond Panoptic Mirror The One Ring The Tabernacle at Pendrell Vale Commanding Forward There's a ton of information in today's article, showing a lot of our thoughts and the results of a ton of discussion from the panel

Zodiark, Umbral God [Borderless Foil] #336 (Magic Final Fantasy | Magic Cards) prices are based on the historic sales