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Hapatra's Snake Factory Hapatra, Vizier of Poisons | Illustration by Tyler Jacobson Commander (1) Planeswalker (1) Creatures (33) Ammit Eternal Arbor Elf Birds of Paradise Blood Artist Boreal Druid Carnifex Demon Channeler Initiate Chatterfang, Squirrel General Craterhoof Behemoth Deathrite Shaman Devoted Druid Dusk Urchins Elves of Deep Shadow Elvish Mystic Evolution Sage Fyndhorn Elves Fynn, the Fangbearer Generous Patron Hooded Blightfang Ivy Lane Denizen Llanowar Elves Midnight Banshee Necroskitter Obelisk Spider Ohran Frostfang Sakura-Tribe Elder Seedborn Muse Seshiro the Anointed Skinrender Soul Snuffers Toski, Bearer of Secrets Wickerbough Elder Yawgmoth, Thran Physician Instants (4) Beast Within Grim Affliction Nature's Claim Second Harvest Sorceries (8) Black Sun's Zenith Cultivate Farseek Kodama's Reach Persist Reanimate Shamanic Revelation Torment of Hailfire Enchantments (9) Animate Dead Beastmaster Ascension Blowfly Infestation Crumbling Ashes Cryptolith Rite Flourishing Defenses Growing Rites of Itlimoc Nest of Scarabs Sylvan Library Artifacts (10) Arcane Signet Ashnod's Altar Golgari Signet Lightning Greaves Phyrexian Altar Skullclamp Talisman of Resilience Throne of the God-Pharaoh Viridian Longbow Whispersilk Cloak Lands (34) Access Tunnel Blooming Marsh Command Tower Darkbore Pathway Deathcap Glade Exotic Orchard Forest x8 Grasping Dunes Grim Backwoods Ifnir Deadlands Karn's Bastion Llanowar Wastes Nesting Grounds Overgrown Tomb Phyrexian Tower Rogue's Passage Swamp x8 Tainted Wood Twilight Mire Woodland Cemetery Hapatra, Vizier of Poisons gives you a theme that you almost never see supported: -1/-1 counters

Latest decks EDH 1 / 1 EDH 17 / 10 EDH 0 / 1 EDH 1 / 3 EDH 12 / 1 EDH 2 / 0 EDH 1 / 0 EDH 9 / 13 EDH 0 / 0 EDH 0 / 0 EDH 0 / 0 EDH 1 / 0 EDH 117 / 54 EDH 4 / 16 EDH 3 / 6 EDH 1 / 0 EDH 0 / 0 EDH 19 / 7 EDH 1 / 0 EDH 1 / 0 EDH 11 / 5 EDH 0 / 0 EDH 30 / 3 EDH 0 / 0

$0.49 Nullpriest of Oblivion Foundations $2.79 Defile Modern Horizons $4.49 Skitterbeam Battalion The Brothers' War $2.79 Steel Seraph The Brothers' War $0.35 Grimdancer Ikoria: Lair of Behemoths $0.99 Triplicate Titan Aetherdrift Commander Decks $1.49 Font of Agonies Ravnica Allegiance $5.99 Vault of Whispers Mirrodin $0.49 Morlun, Devourer of Spiders Marvel's Spider-Man $2.29 Eradicator Valkyrie Kaldheim $0.69 Elegy Acolyte Edge of Eternities $0.59 Undying Malice Innistrad: Crimson Vow 0 results found

In other words, there's no way to have the ability trigger if no permanent you controlled has left the battlefield that turn, even if you intend to have one do so in response to the triggered ability