Tamatoa, the Shiny

Devour X, where X is the number of creatures devoured this way (As this permanent enters the battlefield, you may sacrifice any number of creatures.
This permanent enters the battlefield with X +1/+1 counters on it for each creature sacrificed this way.)
If there are five or more artifacts on the battlefield, Tamatoa, the Shiny gains Trample
and Haste.
"Now it's time for me to take apart your achin' heart"