Time Rifts of Zhalfir

Indestructible
{x}{x} exile {x} nonland permanents you control
{x}{x}{t} return {x} permanents exiled with Time rifts of Zhalfir to the battlefield and put {x} counters on Time Rifts of Zhalfir
If Time rifts of Zhalfir has 5 or more counters exile it and return it to the battlefield transformed under its owners control