Pentagram

When Pentagram enters the battlefield,
choose one creature in graveyard and
put on field.
{2}{b}{t}, Summoning: Look in library and get
Momento Muri or a King of hell.
{4}{b}{b}{b}{b}{t}: Sacrifice Pentagram and
summon all of these planeswalkers and creatures.
Momento Muri and kings of hell.