Eldrazi Monument without prevent damage (sometimes)

Sometimes, when Eldrazi Monument comes into play, prevent damage doesn’t trigger correctly or doesn’t apply for some reason.

There is a green support in the nissa deck negating this

Which I find annoying since TED has no way to get rid of it without just lucky matching. I like the feel of the decks but it’s very easy for either one to get into a position the other can’t get out of. I’d prefer more “back and forth”,l that there was always teh chance to save the day!