Illaoi, the Kraken Priestess

Illaoi, the Kraken Priestess enters the battlefield
with a vessel counter on her.
At the beginning of your upkeep, create X 1/1
blue Spirit Tentacle creature tokens, where X is
the number of vessel counters on creatures.
Whenever a creautre blocks or becomes blocked
by Illaoi, put a vessel counter on that creature.