There are a lot of X/3 which the Tortoise is great at trading with
Aatchik, Emerald Radian Altanak, the Thrice-Called Amzu, Swarm's Hunger Baxter, Fly in the Ointment Fumulus, the Infestation Grist, Voracious Larva Kathril, Aspect Warper Lord Dregg, Insect Invader Mazirek, Kraul Death Priest Stockman, Mad Fly-entist Swarm, Being of Bees Szarel, Genesis Shepherd The Wise Mothman Thriss, Nantuko Primus Vishgraz, the Doomhive Vrestin, Menoptra Leader Wekhdu, Midnight Hunter Xira Arien Xira, the Golden Sting Zabaz, the Glimmerwasp Zask, Skittering Swarmlord
Its important to remember that most decks will be sporting 40 cards, and they can be drained quickly while simultaneously removing threats and accelerating an evasive cipher-fueled agenda
And dealing eight damage divided any way you choose is basically a one-sided wrath