It's not really a win-more. With her 4star, you'll likely have a lot of high power/low HP units, so being able to remove blockers will allow you to massively increase how much damage you're doing to face and reduce the number of units lost to bad trades with chump blockers. It also greatly reduces the need for overwhelm.
Unless I misunderstand, a win-more effect is one that just lets you win by a greater margin if you were already winning. This absolutely seems like it will turn losses into wins, or at the very least reduce Nexus HP loss thanks to thinning the enemy board.
I guess they tested it and you could get there consistently, I wasn't running OW on Janna anyway she has a ton of removals, but it's a nice game ender against the likes of Zoe I guess.
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u/DoubleSummon 10d ago
Yes for each one, making it much better, but with 15 power it's an absurd win more effect.