Grek the Ogre (RG05) [Unknown Event]

Grek gets +1/+1 for each differently named token among permanents you control. Whenever Grek attacks, create one of the following at random you don't already control: *a 1/1 green Donkey creature token, *a 2/2 white Cat creature token, *a 3/3 green Ogre Noble token, *a Swamp token, *a Food token, or *a Gold token.