yes, it has a maximum face of 3, but when you place it on the board it stays there for the rest of the battle, a strategy for late middle-game is to have a single grow & eternal attack die, and all the rest be heal, block and some kind of boost, so that you place the attack down and then you just wait for them to die, like a "spam block and toxic" in Pokémon.
Credit to Chirp87, world record holder (floor 56), for this strategy.