Text (UD/8th/9th): 5/5. ; When you control no other creatures, sacrifice ~this~.
Only checks if you control no other creatures at the time it triggers. It does not check again on resolution. So gaining control of a creature before then will not save the Crocodile. [8E FAQ 2003/07/28]
The ability will trigger if you don't control another creature, even for a brief moment during the resolution of another spell or ability. [Urza's Destiny FAQ 1999/05/25]
