Confidence:StrongSolidPlausibleTentativeSpeculative

• Emrakul's Messenger

  1U

  Creature — Eldrazi Faerie RogueU

  Draw pair: both cards engage with card draw. With a damage-or-draw trigger between them they form a draw engine.
• Rom and Leeta, Unlikely Pair

  3R

  Legendary Creature — Ferengi BajoranR

  Draw pair: both cards engage with card draw. With a damage-or-draw trigger between them they form a draw engine.
• Rings of Brighthearth

  3

  ArtifactC

  Mental Discipline has activated abilities that aren't mana abilities, fueling Rings of Brighthearth's activation-trigger.