Does Sivir scale?

Yes. Sivir scales into a strong late game.

Spell shield is very oppressive, and AoE damage is excellent, but she does not quite hit the absolute ceiling of the S tier because of range issues.

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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