Weirdly, setting up the Shift target Clarabelle Contented Wallflower makes the big Clara less likely to make a big impact
This includes tears, bends that make cards unplayable, and if a significant portion is destroyed by water damage
With all that mana, you can commit to some powerful spells, like Farmer Cotton, which creates Food and 1/1 Hobbit tokens equal to the amount of mana you spend on the X cost of its casting cost
Even in the context of this precon, he is a great attacker who has some upsides if you can summon a few demons to help your cause
This card has two strikes against it: it costs triple blue to cast (just like cousin bombs Arcanis and Future Sight from this block) and blue is generally a weak color in Onslaught/Legions/Scourge
You choose whether to cast the target card while Emet-Selch of the Third Seat's second ability is still on the stack