Armor (shield), very rare (requires attunement)
While holding this shield, you have advantage on saving throws against spells and other magical effects, and spell attacks have disadvantage against you.
A shield is made from wood or metal and is carried in one hand. Wielding a shield increases your Armor Class by 2. You can benefit from only one shield at a time.
Notes: Advantage: Saving Throws, Combat, Warding
Perfect for clerics that want to push a wizard's teeth in! 😉
Does this work against breath attacks?
A dragon's breath weapon doesn't count as a magic spell or effect. It's considered an ability or 'breath weapon'. So unfortunately not, afaik.
Where can I find the actual card for this?
Just get the shield master feat and use your reaction to fully negate a dragon’s breath.
Does this give you advantage on saves that must be rolled each turn? Such as fear effects etc?
"you have advantage on saving throws against spells and other magical effects"
i would say on each spell or magical effect.
fear is not necessarily a magical effect. some fear is intimidation or ability based. for example a dragon roaring isnt magical but can cause fear to those weak willed within earshot. but a ghost gripping your head to create a fear effect would be magical and thus you would have advantage. it also specifies saving throws so if the fear doesnt have a save attached to it then this would not stop that fear regardless.