Expansion is a Strictly Worse Version of Delirium - Rework?

Expansion - After this creature takes damage from a spell, it gains Intelligence equal to 30% of the damage taken.

Delirium - After this creature takes damage, it gains Attack and Intelligence equal to 40% of the damage it took.

As you can see, expansion is strictly worse than Delirium in multiple ways. Buff? Nerf?