YOUR PLAY AREA A game of Magic starts with only players decks and life counters on the table, but once each player has had a few turns to play lands, cast spells, and attack with creatures, a kind of virtual gameboard begins to take shape
These abilities basically translate as protection from everything controlled by a player. Originally designed for Commander, True-Name Nemesis was supposed to be a casual card that was simply difficult for one of your opponents to deal with in a Commander game
Each deck was capable of being the archenemy or being on the hero team
Artifacts like Hedron Archive, Selesnya Locket (and the other lockets), and Dreamstone Hedron can all draw you more than one card when you activate their abilities and sacrifice them
Cathartic Reunion is going to have serious implications in older formats (discarding Golgari Grave-Troll is pretty filthy), but its also going to be a real Standard player