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If your life total can't change, effects that would replace having you gain life with some other event won't be able to be applied because it's impossible for you to gain life

I did a card spotlight on her detailing this so will skip that explanation here

This may seem like a major downside in mono-green decks, and it certainly will matter, however, its ultimately not the end of the world

Players on Reddit pointed out that the unusual wording on Mox Diamond allows you to circumvent this problem, since you can choose not to discard a land to prevent it from ever entering play and receiving a counter

In older Magic sets, the quality and nature of the art varied wildly

Together these cards turn off your opponents planeswalkers and Sagas, buff yours and your lands, and trample over all the opposition