These only represent a small number of the commanders that could be covered
Why Choose Explorers of the Deep
Ashiok, Dream Render Bloodbraid Marauder Bomat Courier Breeches, Eager Pillager Chandra, Pyromaster Chimil, the Inner Sun Circu, Dimir Lobotomist Codie, Vociferous Codex Colfenor's Plans Connecting the Dots Daring Discovery Daxos of Meletis Demonic Dread Diversion Specialist Dungeon of the Mad Mage Etrata, Deadly Fugitive Etrata, the Silencer Extirpate Feldon, Ronom Excavator Flameskull Flash of Insight Grma, Saruman's Footman Guile Headliner Scarlett Ire Shaman Jeskai Infiltrator Lich's Duel Mastery (playtest) Lightning, Security Sergeant Memory Vessel Narset Transcendent Neverending Torment Planeswalkerificate (playtest) Raphael, Most Attitude Redcap Gutter-Dweller Slaughter Games Thada Adel, Acquisitor Undying Flames Visions of Phyrexia
Casting Hydroid Krasis gets you to draw half as many cards as you put into the X cost, while also gaining half that much life
