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The play pattern here is to get Vivi in play, pitch a huge red spell card to cast a free Blazing Shoal and make Vivi enormous, then use Vivi's ability to generate loads of free mana and cast more giant spells, storm off, or simply swing and deal heaps of damage to your opponent with the now embiggened mage

Enter the Bargain, with twice the cost, only skips your draw step, you draw them immediately to cast them or in response to something, and it's even legal as a four of in Vintage where it used to be on the B&R list

It is actually seeing some light play in Standard

Laboratory Maniac is not strictly worse than Thassa's Oracle, seeing as some combos require you to have this card in play and draw cards later