There are cards that say 'x can't be zero' and (outside of a very small group of cards that were errated after print) if the card dosen't have this text x can be zero. If you want to be sure you can always check the 'oracle text' which should reflect weather you can or can not pay x=0.
In the future, please remember to hit the green "mark as answer" button to indicate your question has been resolved. Since this question has been answered for a few days, I have marked an answer on your behalf.
Magic the Gathering, FNM is TM and copyright Wizards of the Coast, Inc, a subsidiary of Hasbro, Inc. All rights reserved. This site is unaffiliated. Articles and comments are user-submitted and do not represent official endorsements of this site.
Flooremoji says... Accepted answer #1
Yes.
There are cards that say 'x can't be zero' and (outside of a very small group of cards that were errated after print) if the card dosen't have this text x can be zero. If you want to be sure you can always check the 'oracle text' which should reflect weather you can or can not pay x=0.
November 25, 2020 3:07 a.m.