Can Seal of Unity pay for itself (can you activate its ability to generate power while finalizing it to pay for its own cost)?

Ruling: No, Seal of Unity cannot pay for itself. Abilities can only be activated when the game object is in the appropriate zone, and permanents like seals need to be on the board to activate their abilities. You have to pay their costs as you finalize them, which is before they are on the board and can be activated.

Sequence:

• You must pay the seal's costs during finalization
• The seal is not yet on the board during finalization
• Only after finalization is complete does the seal enter the board
• Only once on the board can the seal's ability be activated to add power