Unstable Nautilus

Flash
Unstable Nautilus enters the battlefield with two
+1/+1 counters on it.
Whenever an opponent draws a card, put a
+1/+1 counter on Unstable Nautilus.
When Unstable Nautilus is dealt damage or dies,
remove all +1/+1 counters from it and create that
many 1/1 blue Tentacle creature tokens.