Serra, Oketra's Follower

When Serra, Oketra's Follower enters the battlefield target player may search their library
for a card named "Hero's Hammer". Reveal it and
put it into your hand, then shuffle your deck.
Serra, Oketra's Follower enters the battlefield with
life counters equal to the times Serra, Oketra's Follower was cast from the command zone.
Remove a life counter: Regenerate Serra, Oketra's Follower.