It doesn't have defense penetration, but if you attack a defense monster, it will activate the effect of sending GY to him without taking a target, so as long as you are in Defense Position, you can penetrate almost all effects
Ive seen games where Blood Moon landed on turn three, and half the table just stopped functioning
While Sprite can damage from the get go, Yolk begins with zero attack, and therefore needs a boost before it can begin to grow
Aroma decks are also very dependent on their back row as a source of repeated life gain and recursion, and thus their monsters can be rendered almost useless by large-scale spell/trap removal
However, the set highlights smaller creatures, such as frogs, lizard, squirrels, rats and mice, with cats only being given two creatures one being Ygra, Eater of AllYgra, Eater of All, a mythical Calamity Beast found in Valley lore