My opponent had a Nissa, Resurgent Animist in play but for some reason I wasn’t able to target it with removal or block it when my opponent attacked me (it didn’t even tap when it attacked so it was like it had vigilance). Somehow the landfall triggers still happened when my opponent put lands into play. Also there was a turn where I cast a thoughtseize and it showed he had two more copies of Nissa, and when I took one of the other cards out of the opponents hand the next game action caused one of the Nissas to become hidden information behind the sleeves