neither is legal in sanctioned MTG tournaments
In all three cases you secretly choose a card name
This makes permanently dealing with a Timothar players Vampires a huge headache, as they can effectively transform into bats instead of dying
Other cards, such as Sheoldred, Whispering One, can be great for the fact that they continually mess with opponents: old Sheoldred allowed you to return a creature card from your graveyard at the start of your turn, meaning that reanimating her likely nets you free continual reanimation while shes on the field, and ALSO makes your opponents sacrifice a creature during their upkeep, getting around hexproof, indestructible, or other removal resistant barriers
Today's list is largely based on a deck I have in paper, but definitely leave a comment if I overlooked your favorite Green or White human
For land destruction, you do not want to use them until Avacyn is safely on the battlefield