A pretty fun brew with one of the best cards out of Modern Horizons.

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FIRST GAMPELAN - Voltron

Sisay, Weatherlight Captain has a built-in engine that buffs her the more legendaries you play. There's also a Legends Matter package that will directly benefit her as you develop your board.
You can beat the hell out of your opponents just smashing face with her by making her unblockable. Tutoring will help you get the pieces of equipment you need.

-Legends Matter Voltron package: Day of Destiny, Heroes' Podium, Blackblade Reforged, Hero's Blade, Arvad the Cursed
-Tutoring package: Sidisi, Undead Vizier, Tribute Mage, Demonic Tutor, Enlightened Tutor, Razaketh, the Foulblooded

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2ND GAMPELAN - Chain Up

Assuming the board is completely empty and there's nothing on your side of the field to buff your commander, the deck has a few chains to get her from 2, to 9 power on THREE/FOUR triggers, and at which point you can tutor literally anything in your deck. On that spot you can most likely win on the next turn or the next two turns, and also protect yourelf from AoE and single targetted removal. Tutoring Teferi, Time Raveler before your next turn most likely secures the win since it leads to avoiding any interactivity whatsoever.

Remember: This is assuming there's nothing else on the board, if you have any buffs or other legendary creatures you're already in excellent shape.

3 activations:

1. Rhys the Redeemed

2. Judith, the Scourge Diva

3. Arvad the Cursed | Roalesk, Apex Hybrid

Slower 4 activation chains:

1. Rhys the Redeemed

2. Kethis, the Hidden Hand | Anafenza, the Foremost | Drana, Liberator of Malakir | Thassa, God of the Sea

3. Jhoira, Weatherlight Captain | Marchesa, the Black Rose

4. Arvad the Cursed | Roalesk, Apex Hybrid

From there, there's quite a few of creatures selected to both have multiple colors (for midgame play) and help you close the game quickly by swinging:
Aurelia, the Warleader, Gisela, Blade of Goldnight, Mirri, Weatherlight Duelist, Odric, Master Tactician, Saskia the Unyielding

If you want to take it a litle bit more slowly to assert your dominance, you can dig for Razaketh, the Foulblooded or Sidisi, Undead Vizier, to get Seedborn Muse in order to dig multiple times per round

In case protection is needed:
Avacyn, Angel of Hope, Shalai, Voice of Plenty, Sigarda, Host of Herons, or tutoring either protection or countermagic

Other cool interactions:

• Anafenza, the Foremost, Drana, Liberator of Malakir, Roalesk, Apex Hybrid, Shalai, Voice of Plenty put +1/+1 counter on your creatures, and in case of board clear you can tutor up Marchesa, the Black Rose to revive your board at the end of the turn.
• If your board is going to get exiled, you can either tutor Sidisi, Undead Vizier, fetch Teferi's Protection, or Razaketh, the Foulblooded, in order to sacrifice your board and draw a bunch of cards. Bonus points for synergy with the previous interaction.
• Fblthp, the Lost draws two cards if enters from the commander trigger. I just find that very funny.

The rest of the deck is ramp, utility cards, and a goodstuff legendary toolbox for almost any situation.