Twistwood Bramble

Twistwood Bramble enters the battlefield tapped. During your untap step tap Twistwood Bramble rather than untap it.
{ut} : add one mana of any type to your mana pool. Spend this mana only to cast Scarecrow spells or activate abilities of Scarecrows. (The types of mana are white, blue, black, red, green and colorless)