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The cost of using the shield spell comes down to spell slots consumed, which at low levels are extremely limited. Assuming your DM is running more than just one or two encounters per day as the game is designed, then the spell slot limitation will quickly become apparent.
It also costs their reaction and still represents an expenditure of resources. Needing to expend a resource just to have a functional AC, as many wizards and sorcerers do, is already a pretty remarkable vulnerability. No need to have the designed workaround - the shield spell - made into a guessing game.
Shield is a reaction spell, the trigger for which is painfully simple... which you take when you are hit by an attack or targeted by the magic missile spell. You need to have been HIT by an attack. So you need to know the total of the attack to ensure that it did in fact hit you.
In either the basic rules or the player's handbook, under "Casting Time", under "Bonus Action" it states that if a bonus action spell is cast, the only other spell that can be cast that turn is a cantrip. Thus, you can't cast 3 spells in a turn.
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9 sty 2021 · According to answers in this question, you can cast a reaction spell into the Ring of Spell Storing. This works through teamwork, but even then you can probably only do it 5 times before you need to refill the ring.
29 paź 2017 · Given that spells are limited resources and a shield spell is purely defensive, I would personally play it by allowing the player to know the die roll before deciding whether to use the spell or not. However, that decision is completely up to the individual DM and could easily go either way.
