Mostly useless, even when you Synchro Summon a lot.
Tips
Only protects your Synchro monster during Synchro Summoning, useless any other time.
Decks
Rulings
Classifications
Monster/Spell/Trap categories
Prevents activation of your opponent's Effect Monsters / Prevents activation of your opponent's Spell Cards / Prevents activation of your opponent's Trap Cards
Actually, a lot of players waited until the Synchro comes out before responding. It's usually the more logical choice, since it potentially gives a -1 or -2 to the opponent's field.
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