Advertisement Picture all of the cards in your deck set out on a table with the 1 converted mana cost (CMC) cards stacked on one another, followed by the 2 CMC cards, 3 CMC cards, etc

Adept Watershaper Adrix and Nev, Twincasters Alandra, Sky Dreamer Ambassador Laquatus Aquitect's Will Araumi of the Dead Tide Arctic Merfolk Atlantean Cavalry Atlantean Skirmisher Attuma, Atlantean Warlord Augur of Bolas Benthic Biomancer Benthic Criminologists Benthic Explorers Bioluminary Blockade Runner Brineborn Cutthroat Cache Raiders Caller of Gales Campus Composer Cascade Seer Cenote Scout Ceta Disciple Champions of the Shoal Cleric of Chill Depths Cold-Eyed Selkie Combine Guildmage Coral Commando Coral Fighters Coral Merfolk Coral Trickster Coralhelm Chronicler Coralhelm Commander Coralhelm Guide Cosi's Trickster Crackling Triton Cursecatcher Dakra Mystic Dalakos, Crafter of Wonders Darting Merfolk Daughter of the Deep Deepchannel Duelist Deepchannel Mentor Deepfathom Echo Deeproot Champion Deeproot Elite Deeproot Historian Deeproot Warrior Deeproot Wayfinder Deeptread Merrow Deepwater Hypnotist Deepway Navigator Disruptor of Currents Drowner Initiate Drowner of Secrets Eclipsed Merrow Emperor Mihail II Empress Galina Emry, Lurker of the Loch Enclave Cryptologist Enclave Elite Encumbered Reejerey Evidence Examiner Expedition Diviner Expedition Lookout Fallowsage Floodpits Drowner Forensic Researcher Forerunner of the Heralds Frostwind Invoker Furtive Courier Gaea's Skyfolk

Clavileo is how your tiny vampire tokens become permanent vampire demon tokens
Bloodvial Purveyor Bloodvial Purveyor is a HUGE beater, starting as a 5/6 flample for 4 mana and only hits harder from there
More importantly, some cards like Ichor Wellspring and Mephetic Draught can even be used to draw you extra cards so that it doesn't feel like such a particularly awful tradeoff
Sephiroth and Aerith are both part of the main set for Magic: The Gathering Final Fantasy, rather than the Commander Precons, so they will show up in drafts and, possibly, Standard