In exploratory design (which sadly wasn't in our database), we tried a version where Mishra had six different activated abilities, each with its own mana cost
Number 241 Language English Legal Formats Commander, Legacy, Vintage Not Legal Formats Alchemy, Brawl, Competitive Brawl, Historic, Pauper, Pioneer, Standard, Timeless Rulings (12/1/2004) Mycosynth Lattice turns all permanents on the battlefield into artifacts
This means that you can effectively untap mana rocks such as Sol Ring or Mana Vault or loop powerful enters-the-battlefield triggers such as Dockside Extortionist or Spellseeker
High Temple of Oketra At the beginning of combat on your turn, you may choose to give target creature you control Double strike and Indestructible until end of turn