Creeping Tree Tapper

{t}: Tap any number of untapped forests you control. Add {b} to your mana pool for each forest tapped this way.
{t}: Tap any number of untapped swamps you control. Add {g} to your mana pool for each
swamp tapped this way.
"Using its elongated middle finger, the Tree Tapper reaches into the hole it gnawed out and carefully extracts the traveller's life force."