It only makes things shes already decent at better. The problem is she gets another glaring weakness which is, she has no way to relieve pressure.
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Zylach
I was watching videos and your Zelda was great. You definitely should've beaten that diddy, but it seemed like Blaze and Breaker weren't doing much. Have yew tried Flare or Strike? They're both really good.
Flare is great for neutral game, it's better at forcing approaches. It is much faster and has more range. The best part is that it's ridiculously strong. It always does as much KB and damage as Din's Fire's maximum distance, regardless of its difference. It's easier to hit with too. It helps with punishes midrange. Din's Fire or Blaze isn't good for edgeguarding so I think it's worth it.
Strike is the best phantom hands down. It charges really fast and does insane damage. It has no blindspot and uncharged it pushes way farther than default. It also semi-spikes and can gimp some chatacters like Shulk, Link, Mario, etc. You can do many things with it. You can dtilt and bair and airdodge and get a free 30%. Take these to consideration.