The name doesn't fit Entropy? Come on, think a little bit deeper. While its name is "Equilibrium", the card is not an equilibrium at all; what kind of equilibrium hurts and/or heals things? If you know a little bit of chaos theory, you'll know that there is chaos within order, and there is order within chaos; the false equilibrium of this card perfectly exemplifies this. After you play this card, an equilibrium in HP is briefly created, but it will only descend into chaos again as soon as your opponent's turn starts.
OK, I'm just trying to confuse you with the last paragraph
All right, for now I'll change it to averaging percentage.