Even if your opponent has an evasive or big enough creature that Sokrates can't block, you can tap him to prevent the creature's damage and refill you and the attacking opponent's hand
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Since this triggers at the beginning of combat, you can play it after you have a relevant token creature, or play a relevant token creature right after youve played Determined Iteration
However, this isnt to say you shouldnt spend any money
Cost reduction has the benefit that it can be played as soon as turn one (if using Kinjalli's Caller) and scales very well when casting multiple Dinosaurs in a turn
Your opponents are liable to gut you just to end the nuisance of asking what is and isn't itself, theirs, or otherwise