Chrispenbark Dryad

{1}: Tap target dragon. It doesn't untap
during it's controller's next untap step.
{t}: Add {g}.
{t}, Sacrifice Chrispenbark Dryad: Add two multicolored mana. (Two mana of any color.)
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Riku was startled to find several dozen dragons
and drakes entangled in the trees. He was sure
there were no spiders in Chrispenbark.