Orochimaru, The Immortal

{1}{p/c}: Regenerate Orochimaru, The Immortal.
You may sacrifice another creature. If you don't,
Exert Orochimaru, The Immortal.
{3}: Create an Aura enchantment token named
Curse Mark attached to another target creature.
You may activate this ability only any time you
could cast a sorcery.
Other Otogakure you control have haste.