Bleakwoods Burrow

Pay 1 life, {t}: Add {g}, {u}, or {b}.
Whenever a player cast a Spider creature spell,
you may create a number of 1/1 black Spider creature tokens with reach equal to the number
of nontoken Spider creatures on the battlefield. At the beginning of your upkeep, if the total number of Spider creature tokens you control is greater than five, sacrifice Bleakwoods Burrow.