Leyline of PunishmentLeyline of Punishment (5,937 Inclusions, 0% of 2,229,769 Decks) As the long-time pilot of a Sapling of ColfenorSapling of Colfenor deck, I can tell you that there are entire decks that just shut down when the phrase "players can't gain life" enters the chat, but most folks playing Leyline of PunishmentLeyline of Punishment aren't trying to shut you down so much as just keep things on an even playing field for their Group Slug shenanigans
It doesn't matter whether you control a non-Human creature in between those times, or whether you still control one later in the turn
I'm a real sucker for games where people secretly submit their moves for the turn
Since you can cast your opponents spells, you don't really need to have cards that win you the game in your own deck
The main downside comes from the floor: Loot does nothing without a bunch of other permanents in play and gets a nice, fat target painted on its head whenever you cast it