Hastur, The King in Yellow

Suspend 20—{p/w}{p/u}{p/r}{p/g}{p/b}

Players may sacrifice a permanent at any time to
remove a time counter from Hastur.

When Hastur enters the battlefield, players who sacrificed at least 5 permanents this way gain
protection from Hastur. Players who sacrificed at
least 10 permanents this way gain control of Hastur.