The Last City

All creatures you control get +0/+2
{t} add {w}{w}, {w}{u} or {u}{u} to your mana pool
{w}{u}, {t}: Put a drain counter on target creature
{4}{w}{u}, {t}: Tap each creature with a drain
counter, remove one drain counter from each
creature, all creatures don't untap during each
players untap step