({3} magic symbol) ({R} magic symbol) ({W} magic symbol) , plus an additional ({W} magic symbol) ({U} magic symbol) per opponent as necessary each turn available.
Steps
Activate Sunforger by paying ({R} magic symbol) ({W} magic symbol) and unattaching it, searching your library for Officious Interrogation and casting it without paying its mana cost, plus an additional ({W} magic symbol) ({U} magic symbol) as necessary.
Resolve Officious Interrogation, creating at least five Clue artifact tokens.
Activate Time Sieve by tapping it and sacrificing five Clues, causing you to take an extra turn after this one.
Activate Mistveil Plains by paying ({W} magic symbol) and tapping it, putting Officious Interrogation from your graveyard onto the bottom of your library.
Activate Sunforger's equip ability by paying ({3} magic symbol) , attaching it to any creature you control.