29 May 2014
The player on your right can choose the Ogre that Grenzo’s Rebuttal creates.
29 May 2014
If a permanent has more than one of the listed types, it can be chosen for any of them. For example, if the player to your left controls an artifact creature, you could choose it as the creature, the artifact, or both.
29 May 2014
None of the chosen permanents are targeted. A player can choose a creature with protection from red, for example.
29 May 2014
The choices are made in turn order starting with you. However, all chosen permanents are destroyed simultaneously.