18 Jul 2014
The emblem’s ability won’t trigger if a creature attacks a planeswalker.
18 Jul 2014
If you activate the third ability, and the target creature is an illegal target when the ability tries to resolve, it won’t resolve and none of its effects will happen. You won’t gain any life.
18 Jul 2014
The emblem is owned and controlled by the target of the ability that created it. In a multiplayer game, if Garruk’s owner leaves the game, the emblem does not.
18 Jul 2014
The first ability can target and destroy a Garruk planeswalker controlled by another player.