Thanks to Vaporeons ability to transfer energy, youll be able to continuously attack
For instance, heres a take on U/W Spirits that makes use of the card: Creatures (26) 4 Reflector Mage 4 Archangel Avacyn 4 Rattlechains 4 Spell Queller 4 Selfless Spirit 4 Mausoleum Wanderer 2 Cataclysmic Gearhulk Lands (25) Spells (9) This might be too many creatures, but the cheap interaction is just not that exciting
PokeTCG Scanner Dragon Shield is another great app for Pokmon card pricing
There are multiple very relevant threats which survive Lightning Bolt but die to Heat, such as [card]Yawgmoth, Thran Physician, Omnath, Locus of Creation, Crashing Footfalls, Primeval Titan, most Planeswalkers, Yorion, Sky Nomad, and the list goes on
Its the same as not paying four life, which keeps the creature in play