While a 3/3 for 4 is indeed understatted, Sazhs triggered ability means that the card can also snowball the game out of contention if left unchecked
If solving one case isn't enough, there are even more puzzles to be solved, woven into the Murders at Karlov Manor products
This allows you to easily built a ton of value quickly, turning small creatures into giant threats
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Note that Tez can also turn an artifact creature into an artifact creature, so you can make that cool Silver Myr a 5/5 death machine
Sure, Oracle of Mul Daya and Dryad of the Ilysian Grove get close and boast their own upsides, but getting to play 100% more lands than alternatives let you is pretty unbeatable