Shira, Blood-Jewel of the East

If this card is untapped it cannot be the target of spells or abilities.
{t}: Add {3} to your mana pool. Use this ability
only during your turn.
Sacrifice Shira: lose 2 life and add {b}{r} to your
mana pool. Use this ability only if you control
another creature with power greater than Shira's
power.