Playing 4 might be a little heavy since you rather have Giant Growth/Berserk in your hand then 2 Berserks
You can certainly play a mono-color deck
In our Disney Lorcana review, Matt Bassil said, "There's lots to like beyond the Disney theming which is, of course, an instant draw for families and Disney-heads everywhere." I totally agree, and think it holds up as a great experience alongside many of the best card games
Piglet Pooh Pirate Captain feels particularly like a good fit as that character is both a pirate and a captain character
Second of all, he provides an immediate impact on the board and essentially eliminates either a planeswalker, a big creature, or a smattering of little ones to a crisp
The effect is massive and perfectly suited for Commander and with protection from Red it gets to live for another go at it