By "Cannot Stack" do you mean that you can only get 1 turn protection per death no matter how many gatekeepers are in play, or that you can't get more turns of protection while currently protected (i.e. do the gatekeepers not stack or do the turns of protection not stack)?
If you can get more than 1 turn of protection at a time then this + fractal sparks is a little over powered.
If you made that image then I'm really impressed, but if you used a picture you found for the card art then you need to cite the source. (not trying to be rude, just a lot of people don't know how to cite artwork)
Does momentum bypass it?
If gatekeeper is killed do you get a turn of protection?
Not quite sure what you mean by "link magic" but if you just copy/paste a link into a post a clickable link will appear. If that isn't what you're after just find another post that does what you're looking for and click "quote" then you can see what code they typed.