I dont personally think of mono-white when I think of infinite mana engines, but the ol Rings of Brighthearth/Basalt Monolith trick does just fine
Double Major is one of my favorite UG spells, and in the case of Miirym, itll put a copy of Miirym into play first, meaning the non-token copy your Commander will hit the board after, triggering the token copy to make another token copy
You'll reliably get a land, a creature, probably an artifact or enchantment, and then one sorcery or instant even if you aren't building around her
END STEP I hope I brought some old cards to your attention that have become surprisingly useful in the intervening years since they were printed
In the background there are a few scenes from the manga, with some major moments highlighted that fans can check out.
(2018-04-27) Chandra's last ability targets only the player