And if you scry a bunch and built up for an ultimate, putting three artifacts onto the battlefield from your library is game-winning
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While there are guidelines to keep in mind when deck building (no Game Changers in Exhibition or Core, no mass land denial through Upgraded, etc.), the bracket system is emphatically not just "put your deck into a calculator, get assigned a rank, and be ready to play." I deeply appreciate the tools that websites like Moxfield and Archidekt have put together to give you an overall estimate, and they've done some fantastic iteration to help emphasize intent as wellbut I want to stress that any estimate is just an estimate
Just keep in mind that in Firesong and Sunspeaker EDH decks, the lifelink doesnt stack, but its still a very nice inclusion
So much of the deck features cards that can boost or benefit from cards being facedown under them