Dungeon Map enters the battlefield untapped, also taps for mana, and activates for three mana (and thankfully, no tapped legendary creatures)
There also happen to be several other ways to generate multiple spider bodies at a time, and youre going to want to include those, too
Could you pack this into some inefficient stax build that recalls the evil Turbo Stasis decks of yore
Breaking Point
Many commanders like The Gitrog Monster give you tips about what they want, usually by calling out specific card types, zone, or game actionsother similarly simple commanders include Isshin, Two Heavens as One, who demands attack triggers, and Atraxa, Praetors' Voice, which needs some sort of counter to proliferate