Many of the Guilds of Ravnica and Ravnica Allegiance split cards fit the bill because they provide an easy-to-cast front half with oftentimes powerful back halves
The buff from Haunted One means going wide with either Human or Warrior tribal

Abyssal Hunter Achilles Davenport Adwal, Breaker of Chains Agate-Blade Assassin Agent of the Fates All-Fates Stalker Altar Ibn-La'Ahad Anhelo, the Painter Aphelia, Viper Whisperer Arbaaz Mir Arno Dorian Assassin Initiate Aveline de Grandpr Aven Heartstabber Aya of Alexandria Basim Ibn Ishaq Bayek of Siwa Big Game Hunter Bile-Vial Boggart Black Widow, Deadly Hunter Black Widow, Natasha Romanoff Blade of the Swarm Blood Operative Boilerbilges Ripper Briarblade Adept Brotherhood Ambushers Brotherhood Patriarch Brotherhood Spy Bullseye, Death Dealer Bureau Headmaster Cackling Slasher Callidus Assassin Cindering Cutthroat Combustion Man Cruel Sadist Dark Impostor Darkblade Agent Deadeye Duelist Desmond Miles Downwind Ambusher Edward Kenway Eivor, Battle-Ready Eivor, Wolf-Kissed Elektra, Femme Fatale Elena, Turk Recruit Etrata, Deadly Fugitive Etrata, the Silencer Evie Frye Eyeblight Assassin Ezio Auditore da Firenze Ezio, Blade of Vengeance Final-Sting Faerie Fleshtaker Garza's Assassin Gixian Skullflayer Gloom Ripper Goblin Assassin Guildsworn Prowler Guul Draz Assassin Haberthrasher Hagra Sharpshooter Hired Blade Hired Poisoner Hit-Monkey Hooded Assassin Hookblade Veteran Hullcarver Hunter of Eyeblights Iridescent Vinelasher Jacob Frye Kassandra, Eagle Bearer Kelsien, the Plague

Thankfully, even if Gilgamesh is the only Samurai in your entire deck, his ability will still work, letting you attach the equipment he finds to himself
Both of these starter decks include some cards from The First Chapter set , helping to establish the idea for players new to TCGs that cards can be mixed in decks, as long as only two ink types are used
Once modes are chosen, they can't be changed