Use any of the typical untap effects available like Thornbite Staff and any sacrifice outlet, or just copy Zealous Conscripts over and over for an infinite number of token copies, ETB triggers, and untaps for Kiki-Jiki
You have a lot of options here in this deck thanks to the Robin Hoods and Morphs but in the mulligan look to have two shift targets straightaway
The deck uses the Edge of Eternities card Cosmogoyf, and wins by making it as strong as possible, then sacrificing it with the black Fling equivalent, Rite of Consumption, to blast the opponent for massive damage
Take a look at Wizards page on the format for a quick intro to the deckbuilding rules
They feel like they could be a great general to support Hydra tribal, but their design doesnt allow them to interact well with the tribal outside of setting the color identity
Teferi's Time Twist