Forum:Metalsilver Armor's effect

I was wondering if there was some kind of rule that could help me determine which cards can be activated and which cards can't be activated by my opponent when i use this card. Although the rulings do say some things about this i'm still not completely sure i can tell the difference.

The rulings say monster reborn can't be activated because it targets, but reinforcements of the army can. So how do u determine which cards the target can be used and which can't? DeathCaster 00:41, 21 August 2009 (UTC)