Well not to nitpick, but the Cameos can't be strictly worse than the Obelisks, because color identity won't allow you to play Obelisk of Esper in an Azorius deck. In practical terms, it's nice for people to see all the mana rocks that are available, since they might forget that Cameos exist otherwise.
I consider that to go into 'deck-specific exemption'. Similar to how an instant is strictly better than a sorcery unless you have something like Magnivore. Or a 3/3 is strictly better than a 2/3 unless you have something like Meekstone or Wave of Reckoning. Or 2B is strictly better than 1BB unless you have something like Gray Merchant of Asphodel. Et cetera.
tl;dr: Certain decks make exemptions to 'strictly'.
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Card advantage is not the same thing as card draw. Something for 2B cannot be strictly worse than something for BBB or 3BB. If you're taking out Swords to Plowshares for Plummet, you're a fool. Stop doing these things!
You might also want a place for things like sadbot that search for lands.
Finally, a thing about combos. Like, I know my Ghave uses Cathodion and Su-chi with Mikaeus, the Unhallowed as a simple infinite mana and saprolings loop.
(For those who don't understand, you can sac them to Ghave, granting you mana. They come back, you remove a +1/+1 counter from them to make a saproling, and sac them again. You have a net mana gain of C for Cathodion, CC for Su-chi.)
Card advantage is not the same thing as card draw. Something for 2B cannot be strictly worse than something for BBB or 3BB. If you're taking out Swords to Plowshares for Plummet, you're a fool. Stop doing these things!
I consider that to go into 'deck-specific exemption'. Similar to how an instant is strictly better than a sorcery unless you have something like Magnivore. Or a 3/3 is strictly better than a 2/3 unless you have something like Meekstone or Wave of Reckoning. Or 2B is strictly better than 1BB unless you have something like Gray Merchant of Asphodel. Et cetera.
tl;dr: Certain decks make exemptions to 'strictly'.
On phasing:
You might also want a place for things like sadbot that search for lands.
Finally, a thing about combos. Like, I know my Ghave uses Cathodion and Su-chi with Mikaeus, the Unhallowed as a simple infinite mana and saprolings loop.
(For those who don't understand, you can sac them to Ghave, granting you mana. They come back, you remove a +1/+1 counter from them to make a saproling, and sac them again. You have a net mana gain of C for Cathodion, CC for Su-chi.)
On phasing: