A guide on when to pick Illaoi and when not to.
Does the enemy team have 3 or more ranged champs? Dont pick her.
Does the enemy team have a lot of mobility? Dont pick her.
Does the enemy team have a lot of tools to kite? Dont pick her.
Does the enemy team have lots of hard CC? Don't pick her.
Is the enemy team primarily melee, have few hard CC, and limited mobility? Pick Illaoi or pick Darius for more reliability.