tamiyo field researcher
Tamiyo field of researcher ulti bug.
When we activate the ulti of Tamiyo field of researcher, it doesn't allow to cast spells normally. Basically we must pay spell with X for 0. It is impossible to choose to pay with mana from lands.

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BananaHands#07698 commented
Simple bug to fix. Just fix It................................................................................................................................................................
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Nixonsback87#32780 commented
This issue is still going on 7 months later. Just built a deck and ran into it myself.
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Polys#17407 commented
AND it overrides Omniscience (which has the same effect of the emblem) on the battlefield!
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Polys#17407 commented
I have the same problem. I used a card with X mana then it immediately set X=0, no way to choose to cast normally
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gnadalF#18865 commented
You can choose to pay for spells, which already open the overlay, like cycling or double sided cards.
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Qleth#21020 commented
I also have had this problem. You are supposed to have the option to pay if you want to.
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noobistheway#11675 commented
The emblem does not allow for you to pay mana for spells even though it says you MAY cast spells from your hand without paying their mana costs. This needs to be fixed due to being unable to use X casting cost spells as intended.
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BigBirdBigDaddy#98653 commented
Same thing happened to me. I had just ultimated Tamiyo and then tried to use Heliod's Intervention and paying 3 for x. But the client would only let me choose to cast it as x=0. It was extremely frustrating and it almost cost me the game. This should be an easy fix so please fix it right away.
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Foxy#47197 commented
any update on this?
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TheDarkener#56150 commented
Same issue. Tamiyo field researcher's emblem says that you MAY cast spells for free, not that all your spells are free. It does not let you cast spells normally - relevant for things like X spells or spells where colors paid for cost matters (e.g. springmantle cleric).
Should not be difficult to fix because it should work exactly the same way as the card omniscience, they both have the same wording (unless omniscience also has the same bug?)
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Coolbeer Spain#82266 commented
sparksfamilyvalues#95319 doesnt understand that the emblem says "you MAY cast spells without paying it's manacost" On duels it worked perfectly, on arena it does not allow you to pay for spells with X on it's costs
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[Deleted User] commented
Casting a spell without paying its mana cost will mean X will always = 0. You can't change X with mana from your mana pool when casting for free.