Y'all are downplaying Zagred (kotodama devil) way too much and wanking Merlin. And it seems to me as though you all don't actually know too much about Zagred's battle tactics, because
- saying his only way of hurting opponents is using creation magic is false. See pages 9 and 10 of
https://ww5.readblackclover.com/chapter/black-clover-chapter-202/
- You all don't seem to acknowledge that Zagred also has power nullification, and in more than one way. He says "Vanish", and your spell vanishes. Simple as that. It works much like Absolute Cancel, but better. See page 4 of
https://ww5.readblackclover.com/chapter/black-clover-chapter-197/ so, Perfect Cube isn't going to protect Merlin from anything at all.
- Zagred can copy your magic via speech. So, basically anything that is magic that Merlin does, Zagred can copy.
- Hence, teleportation doesn't win her the battle because he can simply return via kotodama magic. BFR is not a winning condition for Merlin.
- Merlin has TK, so does Zagred, in the very same chapter link I gave above, it shows Zagred performing telekinesis.
- Merlin cannot use time stop because it is well-known that this this spell requires 10 minutes of preparation. We know this because 1) It's literally stated on her profile, like, cmon guys, 2) she said his during the final battle vs Chandler, Zeldris, and other demon whose name I forgot.
- Infinity does not make her spells unbeatable. The only thing Infinity does is make the last forever provided they are not countered.
- BFR is not 100% spammable, since she has actively stated that she has a lag of 10 seconds on it. See page 5 of
https://w1.readnanatsutaizai.net/manga/nanatsu-no-taizai-chapter-135/. He can come back within that time and and attack while the 10 seconds pass by. As such, this is further evidence that BFR is not a battle ending condition for either of them.
So with that in mind, I have to strongly disagree with Merlin having more versatility, given that Zagred can do anything she can do. Transparency and Untraceable are not going to do much either.
Merlin doesn't win this battle. This is Incon at best.