If the top of this list is out of reach, the bottom is a genuine vintage grail for the price of a modern booster case
Scarmaker Legendary Creature Spirit Remove a ki counter from Scarmaker: Target creature gains fear until end of turn
Can I just cover it with my hand so they can't see it
First of all it fixes for any color, giving it a lot of flexibility, but it also transforms into a sizable 5/5, which can be key for the middle of your game, or act as a life saving chump blocker closer to the end
It's an artifact, and plenty of cards care about artifacts entering, leaving, or being on the battlefield
Im a big fan of punishing people that think that they can frivolously use their life total as a resource when playing me