Gemshined Canyon Crawler

Gemshined Canyon Crawler can be tapped for any one color of mana, added to your mana pool.
{t}{2}: If Gemshined Canyon Crawler was tapped for mana last turn, add a +3/+3 counter to any creature under your control until end of turn.
The miners of the Gystrad Canyon know better than to keep digging after the walls around them begin to move.