Its the ultimate custom job and has been a term in Magic for ages
Diversion Unit Having a counterspell attached to a good flying creature is usually good in Constructed MTG, and in this case, you dont even need to tap it
Even if it isnt the strongest creature in play, a black creature will use any resource to ensure they come out on top

Oloro, Ageless Ascetic Oloro, Ageless Ascetic | Illustration by Eric Deschamps Commander (1) Planeswalker (1) Creature (10) Archon of Absolution Baird, Steward of Argive Eidolon of Rhetoric Hushbringer Lavinia, Azorius Renegade Silent Arbiter Spelltithe Enforcer Teferi, Mage of Zhalfir Thopter Assembly Realm-Cloaked Giant Instant (16) Blink of an Eye Crush Contraband Epiphany at the Drownyard Fact or Fiction Forsake the Worldly Frantic Search Into the Roil Mana Leak Miscalculation Negate Neutralize Oblation Opportunity Precognitive Perception Rain of Revelation Read the Runes Sorcery (9) Approach of the Second Sun Debt to the Deathless Diabolic Tutor Kaya's Wrath Phyrexian Rebirth Razaketh's Rite Read the Bones Rout Time Wipe Enchantment (12) Arcane Laboratory Aura of Silence Blind Obedience Curse of Exhaustion Frozen Aether Ghostly Prison Kismet Monastery Siege Propaganda Rule of Law Sphere of Safety Telepathy Artifact (15) Azorius Locket Azorius Signet Bloodthirsty Blade Damping Sphere Dimir Locket God-Pharaoh's Statue Knowledge Pool Orzhov Locket Orzhov Signet Prismatic Lens Sphere of the Suns Star Compass Talisman of Hierarchy Time Sieve Wayfarer's Bauble Land (36) Command Tower Dimir Guildgate Dismal Backwater Evolving Wilds Exotic Orchard Forsaken Sanctuary Island x7 Jwar Isle Refuge Myriad Landscape Orzhov Guildgate Plains x12 Salt Marsh Scoured Barrens Submerged Boneyard Swamp x4 Terramorphic Expanse Oloro, Ageless Ascetic is a great commander for learning to play a control deck

Putrid Leech is a dullard of a card, it does nothing other than be very fat for very little mana