Last Dream is Determination's 2nd Epic Effect card added in Beta 11.0 during the UnderCards 1 year Anniversary. It was also the 1st of the 2 leaked on Twitter. (The other being Acceleration.)
This card will give all your monsters +1/+1, just like Grillby, for 4G. However, if your HP is 1, this card will give all your monsters +7/+7 instead, making it work very well with Knife, Loox and Vulkin.