Aquastrand Spider dies, its persist ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it due to its graft ability.
When
Aquastrand Spider enters,
Genesis Chamber triggers, creating a creature token.
When the creature token enters,
Aquastrand Spider triggers, moving a +1/+1 counter from it to the creature token.
Aquastrand Spider dies as a state-based action due to having 0 toughness.