You can play whatever color you like or choose the creature type to get the benefit
On top of everything else, being a creature lets you utilize Venser a lot more than a regular instant, either by flickering or recurring it from the graveyard
Obeka, Splitter of Seconds would actually be number one, but she loses out because she does it too well
Have fun with these Teenage-mana costed cards and let me know in the comments below if you run any of these cards and how good they are for you
Bitterbloom Bearer Black Panther, Hope Enduring Bogardan Hellkite Brazen Borrower Captain Marvel, Earth's Protector Cemetery Protector Chromium, the Mutable Dream Eater Ebondeath, Dracolich Embercleave Endurance Enduring Curiosity Fated Firepower Gandalf the White Glen Elendra Guardian Herald of Eternal Dawn Invasion of Innistrad Jin-Gitaxias, Core Augur King T'Challa Leyline Binding Mistbind Clique Mystic Snake Naru Meha, Master Wizard Notion Thief Pearl Lake Ancient Samut, Voice of Dissent Scout's Warning Selfless Safewright Snapcaster Mage Solitude Spectral Adversary Sphinx of Forgotten Lore Subtlety Surrak Dragonclaw Teferi, Mage of Zhalfir Teferi, Time Raveler The Wandering Emperor The Wandering Rescuer Torrential Gearhulk Vendilion Clique Venser, Shaper Savant Wan Shi Tong, Librarian