Of course no discussion about tribal spells is going to happen without considering changelings, the miraculous subsection of cards that helps to fill out any tribal strategy
Youre specifically looking for Temple of Epiphany, Temple of Mystery, and Temple of Abandon
On just three Colorless-Type Energy, Arceus ex can use Ultimate Force to do 130 damage each turn , so long as you have a full bench
Kappa Cannoneer is a threat that scales fast, too, with each artifact played adding a +1/+1 counter to the creature and making it unblockable
Its not very expensive to get started, if you have the right strategy
I recently logged back in following the betas first big stress test, on July 20th, and the games come a long way