The only precon available for preorder at the moment is Revival Trance which, if I'm honest, feels like a bit of a slight towards Terra
They often come with high power and toughness, making them formidable in combat, and many Beasts have abilities that enhance their strength, generate additional Beast tokens, or interact positively with lands and mana production
That gives you a sheer amount of flexibility in the Bellower that is hard to touch, and for that reason, I rate it highly
In an article of mine in May 2017 looking at top reserve list cards that were surprisingly cheap, I put this card at #4, around $3 near mint
Creatures attack
Most of the time youll choose creature here, particularly in a dedicated Ooze deck, since doing so will let you deploy your slimy soldiers much, much faster