Start with the factual check, since it is the fastest to prove: pull your property report from the City of Saskatoon and confirm the recorded square footage, basement development, garage and lot size actually match your house, because a data error is often the entire case.
If the facts are correct and the number still feels wrong, the comparison argument needs genuinely similar Saskatoon sales near the assessment's base date, not a single favourable listing or a general sense that taxes feel high across the city.
File the paperwork and the fee before the deadline, since the Board of Revision generally will not hear a late appeal on its merits. Get your hand-reviewed valuation from Joel Dyck.