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If this were a tag team wresting match, this would be the part where I tag back to the Experimental Design Team
It also has protection from white, which is very relevant considering that white has a lot of good creatures and spot removal
Note the ETB creature needs to have a power less than or equal to 2
Mega Zeraora ex did the opposite
That gives you a sheer amount of flexibility in the Bellower that is hard to touch, and for that reason, I rate it highly