Braingeyser will let you refill your hand as needed at this point, and you should be able to generate infinite mana, infinite Shivan Dragons, or the opportunity to fire off infinite Braingeysers at your opponents
This cards last reprint was in Maze of Millenia and can activate its Effect when your opponent Activates a Monster Effect on your turn
Guardian Project, as a result, isnt the best in two player formats
The challenges that you would normally see as exciting seem instead to make you feel as though you cannot overcome them
Not only that, but it can trigger multiple times per turn just by casting non-creature spells
Creepiness is subjective, and many of these are the ones that I find personally scary, so know that your favorites may not make this list