What is the difference between the old and new text of Sigil of the Storm, and why was the change made?

Ruling: The new text prevents you from targeting a rune when the effect triggers, instead requiring you to recycle a rune upon resolution. This change prevents the interaction where you could recycle a targeted rune before the effect resolved to float a power.

Sequence:

• Old version: Target a rune when triggering the effect, then recycle it on resolution
• New version: No targeting on trigger; must recycle a rune directly upon resolution

Nuances:

• The old version allowed recycling the targeted rune before resolution to generate floating power, which the new version prevents