Skullclamp attached to another creature you control.
Steps
Activate Ashnod's Altar by sacrificing the creature with Skullclamp attached, adding ({C} magic symbol) ({C} magic symbol) .
The creature dies, triggering Skullclamp, causing you to draw two cards.
Nadir Kraken triggers twice, causing you to pay ({2} magic symbol) to put two +1/+1 counters on Nadir Kraken and create two 1/1 Tentacle creature tokens.
Activate Ashnod's Altar by sacrificing a Tentacle, adding ({C} magic symbol) ({C} magic symbol) .
Activate Skullclamp by paying ({1} magic symbol) , equipping it to a Tentacle token.