World Within

World Within can be activated by every player.
{3}: create a 1/1 colorless Eldrazi Scion creature token. It has "Sacrifice this creature: Add {c} to your mana pool"
{4}: search your library for a land card, reveal it and put it into play tapped. Shuffle your library.
{5}: create a 3/2 colorless Eldrazi Horror creature token.
{p/c}{p/c}{p/c}{p/c}: destroy World Within.