If I have two Thorncaster Slivers, do the other slivers I have get the "1 damage" ability twice?
If not, why? What rule makes it so they can't have the ability twice? If I had a different card with same ability would they get it twice? What if the different card had a slightly different wording? Or caused 2 damage instead of 1?
At what point would they start to stack( if ever)?