Finishers and removal
Its also way cheaper, and with this card in play, just casting cards like Burglar Rats already gives you a big resource advantage
Korlessa, Scale Singer
Here are the banned cards for this format: Ancestral Recall Balance Biorhythm Black Lotus Braids, Cabal Minion Chaos Orb Coalition Victory Channel Emrakul, the Aeons Torn Erayo, Soratami Ascendant Falling Star Fastbond Flash Gifts Ungiven Golos, Tireless Pilgrim Griselbrand Hullbreacher Iona, Shield of Emeria Karakas Leovold, Emissary of Trest Library of Alexandria Limited Resources Lutri, the Spellchaser Mox Emerald Mox Jet Mox Pearl Mox Ruby Mox Sapphire Panoptic Mirror Paradox Engine Primeval Titan Prophet of Kruphix Recurring Nightmare Rofellos, Llanowar Emissary Shahrazad Sundering Titan Sway of the Stars Sylvan Primordial Time Vault Time Walk Tinker Tolarian Academy Trade Secrets Upheaval Yawgmoth's Bargain MTG Standard banlist Here are all the banned cards for MTG Standard: The Meathook Massacre Fable of the Mirror-Breaker Invoke Despair Reckoner Bankbuster MTG Modern banlist Modern covers Magic: The Gathering cards from the eighth edition to today: Ancient Den Arcum's Astrolabe Birthing Pod Blazing Shoal Bridge From Below Chrome Mox Cloudpost Dark Depths Deathrite Shaman Dig Through Time Dread Return Eye of Ugin Faithless Looting Field of the Dead Fury Gitaxian Probe Glimpse of Nature Golgari Grave-Troll Great Furnace Green Sun's Zenith Hogaak, Arisen Necropolis Hypergenesis Krark-Clan Ironworks Lurrus of the Dream-Den Mental Misstep Mox Opal Mycosynth Lattice Mystic Sanctuary Oko, Thief of Crowns Once Upon a Time Ponder Punishing Fire Rite of Flame Seat of the Synod Second Sunrise Seething Song Sensei's Divining Top Simian Spirit Guide Skullclamp Splinter Twin Summer Bloom Tibalt's Trickery Treasure Cruise Tree of Tales Umezawa's Jitte Up the Beanstalk Uro, Titan of Nature's Wrath Vault of Whispers Violent Outburst Yorion, Sky Nomad MTG Vintage banlist The vintage format lets you use any card from Magic: The Gathering's history - apart from banned cards
So, my evaluation comes from my own biases, which boil down to: play the sort of cards and decks that lets everyone at the table have a chance to breathe, play Commander, and have at least a decent chance to do the thing that their deck wants to do
For just six mana, Seshiro provides what is essentially a permanent Overrun for all of your other Snakes, and lets you draw a card whenever one gets through for damage
