Meddlesome Monarch

Partner with Luminary Sovereign (When this creature enters the battlefield, target player may put Luminary Sovereign into their hand from their library, then shuffle.)
Whenever Meddlesome Monarch enters the battlefield or attacks, each player mills the top two cards of their library into their graveyard. You gain 1 life for every Instant or Sorcery spell put into a graveyard this way.