I looked at three main types of attack triggers: 1) whenever a creature you control attacks, 2) whenever a creature attacks, and 3) whenever a creature attacks you or a planeswalker you control
Ideally, you play themes that complement each other, like playing Spirits with a subtheme of exiling cards, or playing Zombies with a graveyard subtheme

Advanced Search Sets Random Syntax Acererak the Archlich Adorned Crocodile Adorned Pouncer Angel of Sanctions Angrath, Captain of Chaos Anikthea, Hand of Erebos Anointer Priest Aphemia, the Cacophony Archdemon of Unx Ashnod, Flesh Mechanist Assemble from Parts Assemble the Rank and Vile Aven Eternal Aven Initiate Aven Wind Guide Bladewing, Deathless Tyrant Bleeding Edge Bone Miser Boneclad Necromancer Bridge from Below Callous Dismissal Cellar Door Cemetery Reaper Champion of Wits Commence the Endgame Corpse Cobble Corpseweft Cradle of the Accursed Crowded Crypt Crush Dissent Cryptbreaker Curse of Disturbance Curse of Shallow Graves Curse of the Restless Dead Cursecloth Wrappings Death Tyrant Deathknell Berserker Deluge of the Dead Diregraf Colossus Doomed Dissenter Drana's Chosen Draugr's Helm Dread Summons Dreadhorde Invasion Dreadhorde Twins Dreamstealer Drunau Corpse Trawler Dunes of the Dead Dying to Serve Earthshaker Khenra Embalmed Ascendant Enter the God-Eternals Essence Anchor Eternal Skylord Falcon Abomination Fanatic of Rhonas Feast or Famine Field of the Dead Flip the Switch Forlorn Pseudamma Geralf, Visionary Stitcher Geralf, the Fleshwright Ghoulcaller's Accomplice Ghoulish Procession Gleaming Overseer Glyph Keeper God-Eternal Oketra God-Pharaoh's Gift Graf Harvest Gravedig Graveyard Marshal Grim Initiate

The Pokmon-themed box is filled with exclusive gear and vintage collectibles including vintage cards, toys/figures, booster packs, artwork, accessories, and more - lets you unleash your inner Trainer
It conditionally gains Rush against a DON
There are a couple, including some flashback spells and some graveyard recursion, so triggering it definitely isnt out of the question