So, +1 Rare is a lot bigger than +0.05 Rares
While he can certainly perform admirably within the context of this precon, I believe that youll probably get more mileage out of this deck by replacing Szarekh, the Silent King with one of the other commanders if you plan to upgrade this deck to play in higher power tables
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Let's walk through the major choices: Standard Discard (sample: Mind Rot) I play an instant or sorcery (mostly a sorcery but we'll get to that in a bit)
The triggered ability resolves before Decimator of the Provinces enters the battlefield, so it wont get +2/+2 from its own triggered ability