Allison, Assassin of Zuhelgo

When Allison, the Assassin of Zuhelgo enters the battlefield, you gain 5 life and have hexproof.
Each turn, you gain life equal to the combined attack of all creatures on the battlefield, in the graveyard, and in exile.
This card cannot be blocked
Pay 1 Life: Destroy target creature
If this destroys a creature, your opponent loses life equal to double of this creatures current attack, and the current attack of that creature, combined.
Lifelink, Hexproof, Indestructible.