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Thassa, God of the Sea seems like it would be great in a go-wide merfolk deck, and it does have a place there because its activated ability helps with Coastal Piracy types of effects
Other than specific cards that have "Trample Over Planeswalkers", you won't take any excess damage dealt to a Planeswalker
That said, Id prefer a commander with more than a single ETB effect, especially if that effect wont be too impactful until later in the game
Also, dont get stingy with your mana base, as stax effects often make things more expensive
The Red Menace Contained While Izzet Prowess was the best deck, Mono-Red Aggro was the formats gatekeeper, responsible for many of those dead by turn four games