Docent of Perfection, Sedgemoor Witch, and Talrand, Sky Summoner are classics that can serve as your blockers and threats
With toxic it'll deal it's normal 2 damage for Commander Damage and normal, but 2 poison too, and won't expose you to counter attacks
This discovery caused Mortuary to more than double in price, hitting around $15
They're all very easy to Tutor up via cards like Enlightened Tutor, Mystical Tutor, Idyllic Tutor, Solve the Equation, Fabricate, Reshape, Transmute Artifact, Reckless Handling, Goblin Engineer & Gamble, in addition to being easy to recur via your Commander's ability
I like it also because it flies, helping to trigger anything from Chivalric Alliance to strong equipment triggers, with less risk
Just make sure the card isn't completely dead if you're not facing that archetype