Possible masterpiece bug

Iworb
Iworb Posts: 61 Match Maker
I've got "Dark ritual" masterpiece. It says: "The first card in your hand gains full mana". When you cast this spell it gives you +30 mana (related to tips). BUT there's some cards with passive like: "Remove creature to opponents hand and it cost 300 more". Or "Sphinx's Tutelage" with ability "Whenever you draw a card, the first card in your opponent's hand costs 2 more" which could increase card cost more than 30.
So PROBABLY masterpiece card could act in wrong way. Who can confirm or reject that behaviour?
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