Tifa Lockhart is one of a couple of good candidates for the Buster Sword, and you can have her on the board pretty early in the game too

Mystic Intellect Commander (1) Planeswalker (1) Creatures (19) Backdraft Hellkite Burnished Hart Clever Impersonator Cliffside Rescuer Crackling Drake Dockside Extortionist Elsha of the Infinite Gerrard, Weatherlight Hero Guttersnipe Pramikon, Sky Rampart Pristine Angel Pristine Skywise River Kelpie Scaretiller Sun Titan Talrand, Sky Summoner Thalia's Geistcaller Wall of Stolen Identity Zetalpa, Primal Dawn Instants (15) Chemister's Insight Desperate Ravings Fact or Fiction Farm // Market Fervent Denial Increasing Vengeance Leadership Vacuum Magmaquake Mandate of Peace Oona's Grace Prismatic Strands Purify the Grave Ray of Distortion Refuse // Cooperate Think Twice Sorceries (13) Deep Analysis Devil's Play Divine Reckoning Dusk // Dawn Faithless Looting Ignite the Future Increasing Devotion Mass Diminish Mystic Retrieval Rolling Temblor Runic Repetition Sevinne's Reclamation Storm Herd Enchantments (4) Burning Vengeance Ghostly Prison Jace's Sanctum Secrets of the Dead Artifacts (7) Armillary Sphere Azorius Locket Bloodthirsty Blade Commander's Sphere Empowered Autogenerator Izzet Locket Sol Ring Lands (40) Ash Barrens Azorius Chancery Boros Garrison Boros Guildgate Command Tower Evolving Wilds Exotic Orchard Highland Lake Izzet Boilerworks Izzet Guildgate Myriad Landscape Mystic Monastery Prairie Stream Stone Quarry Swiftwater Cliffs Temple of the False God Terramorphic Expanse Tranquil Cove Wind-Scarred Crag Island x8 Mountain x4 Plains x9 The Commanders Another creation using Jeskai colors doing typical Jeskai Commander things

If you look at the text, you can get this trigger from your attacks, too, which is wicked
Deck Overview
Naturally, Hakbal himself is a great target for this, since his attack trigger will get more value over time if he lives to tell the tale, but you can also sneak through veteran Merfolk tokens that have accrued a good number of +1/+1 counters via explore for big damage as well