Hagrid

Trample, Teacher
Hagrid's Power and Toughness are equal to the amount of lands you control.
{3}{w}{t} Add all the land you have in your hand to the battlefield tapped.
{4}{w}{t} Add all the land you have in your graveyard to the battlefield.
Sacrifice Hagrid, Lands you control produce double the amount of mana when you tap them until end of turn.
I shouldn't have said that.