Skullcaller

{t}: Add {g} to your mana pool. If you control
three or more creatures, add {g}{g} instead.
{t}: Add {b} to your mana pool. If there are three
or more creature cards in your graveyard, add
{b}{b}{b} instead.
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It is said that the warlocks of these woods not only
control the living, but the dead as well.