[Yark]

Then pick up God Rod. In any case, the point is that an extremely rare 10* is far weaker than a common 10* that can be reliably farmed by killing groups of Sliders in a crazy Crypt.

Logically, it makes sense that the rarer items should be slightly stronger - or at the very least as strong. Your absurd scenario of maxing out the buff with 40 plants in range is not ever going to happen, and even if it did, it would still be objectively inferior to Bloody Palms in terms of damage output.