With 20/20 hindsight, R&D believes we hit the typal theme a little too hard
You can either pair two creatures with the generic partner keyword (the most infamous, top tier of commanders is the pair: Thrasios, Triton Hero and Tymna the Weaver) or you can use creatures that have specific partners with abilities, like Haldan, Avid Arcanist and Pako, Arcane Retriever or Amy Pond and The Eleventh Doctor or Rory Williams
And Thassas Oracle is more of a card than any of the similar options
One more solution at home are select food storage containers
There are also some disadvantages to them
You can tap any three untapped artifacts and/or creatures you control, including Warden of the Inner Sky itself and other creatures you haven't controlled continuously since the beginning of your most recent turn, to pay the cost of Warden of the Inner Sky's activated ability