If the creature is no longer on the battlefield at that time, use its power from when it was last on the battlefield
However, as the saying goes, three out of four isnt bad
Playing a two drop would be a far better use of your second turn than casting this
When taken at face value, Imotekh the Stormlord comes across as an artifact creature go-wide commander with an emphasis on combat
That stipulation wont be too much of a problem though, with all the different effects that cost life in Magic, youll sure to be able to trigger it fairly regularly without doing much else
Professional Face-Breaker seems like a great fit for a deck featuring Tymna the Weaver or Malcolm, Keen-Eyed Navigator and a partner with red, being an evasive body that can create a treasure for each player that you hit during combat and allowing you to sacrifice treasures for impulsive draw