Lifesteal is fun.
Vicious Rejuvenation is fun.
Eclipse is fun. Wouldn't it be great to combine it all?
The main goal of this deck is Rejuvenation
Vicious Rejuvenation is the most fun way to win. If your opponent has been hitting you a lot, this can help you get back in the game.
Eclipse summons a radiant that lets you pay 5 life for a buff to all your units. We don't actually care about the buff, but about the cost. Being able to lose massive amounts of health at your will for no power cost means you can play eclipse one turn and lose all your health and swap health the next. After that it's just a matter of finishing the game.
Of course, if the game goes differently, this might not be needed. Use your own judgement on when to go for Rejuvenation or when to attack normally.