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This ones good enough to break containment and see play in other formats

Vicious Offering is better at killing weaker creatures since it can be cast at instant speed, but it is weaker against powerful creatures since the effect only lasts until the end of turn

Yes, mostly, but it does see fringe play in Iname, Death Aspect black spirits and Doran, the Siege Tower big butts decks

A sealed Hot Water Theme Deck

The card should work very well alongside creature-lands, and being able to use Granted to easily fetch and surge Crush of Tentacles the turn after you get your Fires of Invention onto the battlefield sounds potent also