Alastair, Natures Chef

When Alastair, Natures Chef enters the battlefield, search your library for a creature with
CMC 6 or greater reveal it & put it into your hand
{t} Target creature you control fights target
creature you don't control, if a creature enters the graveyard this way you gain {x} mana of any
colour where {x} is that creatures toughness
Dinner's nearly ready, I hope you're not vegetarian