Sign in Blood and Extra Turn Sorcery in exile (exiled by
Spellweaver Helix).
All other permanents on the battlefield (
Scheming Silvertongue // Sign in Blood prepared).
Steps
Cast the non-card copy of
Sign in Blood from exile by paying ({B} magic symbol) ({B} magic symbol) , unpreparing
Scheming Silvertongue.
When you cast it,
Spellweaver Helix's last ability triggers, allowing you to cast a copy of the Extra Turn Sorcery without paying its mana cost and take an extra turn after this one.
Resolve the copy of
Sign in Blood, causing any player to draw two cards and lose 2 life.
Use the Repeatable Silvertongue Preparer to gain at least 2 life.