Replace Pluto with Doc or Lantern As lovable as Pluto undoubtedly is, there are better options in the game if you want to cut down ink costs
Fanatical Devotion can keep Teshar around as long as you have creatures to sacrifice, for example
Terra, Magical Adept / Esper Terra Because Esper Terra has all five colors of mana on the final chapter, Terra, Magical Adept counts as a 5-color commander, and it was clearly designed to be Summon.dek
Its worth noting that while effects like Tamiyos Safekeeping and Blacksmiths Skill will serve you well, its often more mana efficient to run Ephemerate
Would you like to see it come back in future sets
Based on Urza, High Lord Artificer , this card creates a 0/0 colorless creature that gains a +1/+1 counter for each artifact you control