Kobold Warrens

Kobold Warrens enters the battlefield tapped
unless you pay 2 life
{t} Add {b},{g} or {r} to your mana pool
Don't alert the kobolds—
{t}{2}{r} target player attacking you rolls a stealth
check DC 13. if they fail, you create 3: 0/1
kobold tokens and if they roll a 1 create 6 instead