Veiled Crocodile

A noncreature permanent that turns into a creature can attack, and its abilities can be activated, only if its controller has continuously controlled that permanent since the beginning of their most recent turn. It doesn't matter how long the permanent has been a creature.

It can trigger even if a player's hand is empty momentarily during the middle of the resolution of a spell or ability.

When it turns into a creature, it is no longer an enchantment.