I much prefer seeing transform cards than separate entities to bloat a set
This is basically only getting played in Commander, and I dont see this milling anyone out outside of some kind of infinite combo where you can play infinite lands per turn
Once a Strefan player has amassed several blood tokens, when Strefan attacks, two blood tokens can be sacrificed in order to put a vampire from its controller's hand directly onto the battlefield, tapped and attacking 14 Olivia's Wrath The use of Board Wipes is key in Commander in order for players to clear out an opponent's overwhelming board state
Clarabelle, Light on Her Hooves Emerald Ink Clarabelle, Light on Her Hooves is a 7 Ink, 5/6 Floodborn Ally with a Shoft cost of 5
Here is my short list: Emrakul is a card that is only going to get more obnoxious the larger the format is
Fraying Sanity: A 'mill the milled' effect, that is just awesome