Kraken Infested Waters

Kraken Infested Waters enters the battlefield tapped.
{t}: Add {b} to your mana pool.
{2}{u}, {t}: Add {u} to your mana pool for each untapped octopus you control
{7}{u}{b}, {t}, Sacrifice Kraken Infested Waters: Kraken infested waters deals X damage to target player where X is the number of untapped octopus creatures you control.