Doubling your mana is already good, but giving all your creatures +1/+1 really puts it over the top especially in go wide strategies like token decks
Her 'The Singing Sword' ability also lets her challenge ready characters whenever you play a song on your turn, so there's basically no escape from her blade
Magus of the Wheel and Wheel of Misfortune are budget alternatives, but are wheels even good in Commander
There will be more cards of a rare and mythic rare power level, but adapting to that (making sure players have more answers at lower rarities) is part of how R&D is adjusting our set designs
The only exceptions are Commander, which is another beast on its own, and Limited formats such as Draft, which has a minimum deck size of 40 cards
He's a Zoologist, but strangely, he doesn't care about whether those tokens are creatures or not