Skull Kid, The Lost Trickster

Skull Kid, The Lost Trickster's power is equal to
the number of non-permanents in target player's graveyard.
{b}{b}, sacrifice target creature you control: Search
your library for a card called Majora's Mask, Soul Corrupter and place it in your hand, it now costs
half of your life in mana to cast, rounded down.
Pay 1 life: Draw a card.
"Children who are lost to the forest transform
into a Skull Kid."