Can you float a rune in response to Sigil of the Storm's concentrate trigger before it gets recycled, or must you float the rune before you concentrate?

Ruling: You can float a rune in response to Sigil of the Storm's concentrate trigger before it resolves and recycles the rune.

Sequence:

• Concentrate Sigil of the Storm, putting its trigger on the chain
• Use the Reaction ability inherent to Runes to float the resources you want
• Resolve Sigil's trigger