A legitimate landlord or property manager in Saskatchewan will let you view the unit, will accept a deposit only once you are actually ready to sign a lease, and will give you a written lease naming the landlord and the property, since the Residential Tenancies Act sets out what a valid tenancy agreement has to include. A listing that avoids all of that, or that only communicates by text and refuses a phone call, is worth treating with real suspicion.
Price is another signal: a unit listed well below what comparable Saskatoon rentals are actually asking is often bait, especially if the listing photos do not match the exterior you can see on the street or on a map. Cross-checking the address and the landlord's name against the property's actual ownership is a step that takes about 10 minutes and catches a surprising number of scams before any money changes hands.
If a deal feels rushed, ask yourself why; a legitimate landlord is rarely in more of a hurry than you are. Get your hand-reviewed valuation from Joel Dyck.