You can tap any number of untapped creatures, however, even if they won't reduce the cost further
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The full list of Conspiracy cards banned in Commander is: Adriana's Valor Advantageous Proclamation Assemble the Rank and Vile Backup Plan Brago's Favor Double Stroke Echoing Boon Emissary's Ploy Hired Heist Hold the Perimeter Hymn of the Wilds Immediate Action Incendiary Dissent Iterative Analysis Muzzio's Preparations Natural Unity Power Play Secret Summoning Secrets of Paradise Sentinel Dispatch Sovereign's Realm Summoner's Bond Unexpected Potential Weight Advantage Worldknit Ante cards Nine cards that reference 'playing for ante' are banned in Commander and all other formats
It's demanding a fairly high price right now at $126.26 at TCGplayer, but if you really want this card, you can also just pick up its Super Rare variant for around $4 instead
