Preparation
Reduce the cost of the next spell you cast by two mana.
-upon using, the mana of the spell is visually reduced, and the effect is applied
-Using a 2nd preparation in a row, with only one other spell in your hand, does not reduce the spell by two mana. it reduces it by zero.
Had two preparation spells in my hand and one other spell.
Cast #1: other spell goes from 4 mana to two.
Cast #2: only a single spell in my hand listed as 2 mana, does not get reduced by two less mana as per the spell.
edit: My rebuttal for “it’s not supposed to stack”
~https://www.lauramaliszewska.com/advanced-grammar-university
Preparation is a spell so you use the first discount on it. Same thing happens if you use coin after spell discount
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Read the text of the card again a bit closer.
Hint: What Type of card is Preparation?
You can do it!
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And preparation is a spell, which was the next spell you casted. You even said it yourself:
So, that’s three spells you had in hand.
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Preparation is a spell… and counts as the second spell you play, so now you know never to play it twice in a row.
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Yeah I missed that.
Shouldn’t it have become -2 and refunded 2 mana? Basic Math imo 
there is no negative mana in the game
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yeah, obviously math that results in negative numbers escapes the devs
Do you know that this is a game and not real life? Developers have the right to apply any rules
You do know that with a university degree the concept of negative numbers should not elude said former students.
If you make a video game, who decides what the rules are?
you are talking about math in real life. developers have the right to change this in their own game as they wish.
There’s a variety of things that don’t work ‘like in real life’ especially in regards to numbers. Most of them are more like hidden rules, such as costs never going below 0. It’s just part of the game. At this point, any further arguing is just trolling.