Does Nidalee scale?

No. Nidalee gets actively worse as the game goes on.

Not much late-game value aside from heal for allies. Spear damage is tough to hit and not very reliable. Typically gets engaged on later on and dies fairly easily, or gets ignored because she has no way in the fight without getting one-shot.

The grade measures one thing: how much a champion can influence a coordinated late-game objective fight once both teams reach full builds. It does not measure early strength, snowballing, or win rate. A weak late-game champion still wins by ending the game first, which is what the rest of the library teaches.

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