Many of these kaiju were spin-offs of existing monsters in pop culture, such as Godzilla
The -3 lets you destroy a target creature, and finally, the -6 gives you an emblem that states "whenever you gain life, target opponent loses that much life." Given that this card only costs four mana to cas t, it, like most of Witherbloom, is quite finely balanced and should see plenty of play across Standard and Commander
Kudo, King Among Bears evens the playing fieldthough you can break the symmetry by loading your deck with anthems like Flowering of the White Tree and Maja, Bretagard Protector that ensure you have the biggest creatures
If you are the one being attacked, you can use your Pokmons defense mechanisms if they have one, and also keep track of how much HP you have left