Whenever you cast a historic spell, create a 1/1 white Soldier creature token. (Artifacts, legendaries, and Sagas are historic.)
Whenever Alistair attacks, you may pay . If you do, creatures you control get +X/+X until end of turn, where X is the number of historic permanents you control.
Build a wide board by casting historic spells (artifacts, legendaries, Sagas) to spam 1/1 Soldier tokens, then convert that go-wide army into a lethal swing with Alistair's overrun-style attack trigger. You ramp into a dense legendary/artifact shell early, snowball tokens through the midgame, and close by pumping the whole team based on your historic permanent count.
Generates a steady stream of tokens just by playing the artifacts and legendaries a good deck wants anyway
Bant access to ramp, card draw, protection, and the best historic permanents in the game
Built-in win condition via the +X/+X attack trigger that doesn't require extra combo pieces
Synergizes with both artifact and legendary themes, giving deep deckbuilding flexibility
The attack tax is steep and slow without serious ramp or cost reduction
Token strategy folds to board wipes and sweepers, costing you both bodies and tempo
Alistair himself is a 4-mana commander that contributes little until you build around him
Vulnerable to fliers and pillow-fort defenders that blank a ground-based go-wide plan
Protects your wide board from the sweepers that would otherwise blow you out.
Prioritize ramp and cost reduction (Smothering Tithe, treasures, mana rocks) so the attack trigger comes online consistently, and add token doublers like Anointed Procession and Parallel Lives. Lean into anthem effects and protection spells to survive wraths, and consider an Aristocrats subtheme with Blood Artist and a free sacrifice outlet as a backup win. Tighten the historic count with efficient legendaries and artifacts that double as utility, and add overrun redundancy like Craterhoof Behemoth or Overwhelming Stampede for closing power.