The four most powerful cards in Pioneer are Fable of the Mirror Breaker, Treasure Cruise, Unholy Annex, and Arid Archway
The point is just to have a good time, and find what gives you the most from your gaming experience.
All the Battles in this set have the subtype Siege, implying that future Battles might play out differently

The deck: Rebel Tribal Comparative Analysis 34 Lands 11 Ramp : Myriad Landscape, Knight of the White Orchid, Arcane Signet, Sol Ring, Boros Signet, Patchwork Banner, Talisman of Conviction, Aetheric Amplifier, Firdoch Core, Zuko, Firebending Master, Great Train Heist 8 Target Removal : Kabira Takedown, Jet, Freedom Fighter, Rip Apart, Defiant Vanguard, Bound in Silence, Crib Swap, Volt Charge, Razorgrass Ambush 3 Board Wipes : Hour of Reckoning, Martial Coup, Winnowing 2 Graveyard Recursion : Ramosian Revivalist, Lin Sivvi, Defiant Hero 1 Graveyard Hate : Scavenger Grounds 7 Tutors : Axgard Armory, Ramosian Sergeant, Ramosian Lieutenant, Defiant Vanguard, Defiant Falcon, Ramosian Captain, Lin Sivvi, Defiant Hero 7 Protection : Your Temple Is Under Attack, Darksteel Plate, Whispersilk Cloak, The Duke, Rebel Sentry, Sejiri Shelter, Swiftfoot Boots, Lightning Greaves 9 Card Draw : Mentor of the Meek, Idol of Oblivion, Banon, the Returners Leader, Neyali, Suns Vanguard, Glimmer Lens, Welcoming Vampire, Tocasias Welcome, Your Temple Is Under Attack, Smellerbee, Rebel Fighter 14 Finishers/ Surprise /Alternate win conditions : Mirror Entity, Neyali, Suns Vanguard, Goldwardens Gambit, Hexplate Wallbreaker, Karlach, Fury of Avernus, Otharri, Suns Glory, Breath of Fury, Overpowering Attack, Cathars Crusade, Great Train Heist, Goldnight Commander, Valor in Akros, Kinbinding, Shared Animosity As we see form the comparative analysis, the rates per category are good

Assassins Trophy gives you so much game against the field that your sideboard is free to attack your expected metagame, not just get you to a passable 60 in most matchups