Titan of the Tidals

When Titan of the Tidals enters the battlefield, put a smog counter on each other blue creature.
Blue creatures with smog counters on them get -4/-1 and have "{t}, Sacrifice this creature: Put a smog counter on target creature. Then, tap that creature."
Nonblue creatures with smog counters on them have "This creature doesn't untap during its controller's untap step."