If you're interested in this commander, check out our recent Commander Spotlight
For attainable modern Japanese cards, V-UNION, VMAX Climax, 25th Anniversary, and Pokemon 151 cards are more useful
In spite of how common multicolor decks are these days, you can almost certainly find an opponent to freely swing at if your creatures have fear
Miirym, Sentinel Wyrm gives you a super powerful ability on an easy-to-cast Commander, who happens to be one of the strongest Temur cards
And yes, there have been a few changes to rules since then, such as the loss of card types like interrupts and poly artifacts, but very little comparatively
If a creature has a characteristic-defining ability that sets its power and toughness, indicated with a */* or similar in the power and toughness box, that ability is taken into account when determining its base power and toughness