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When its controller has three or more Instants or Sorceries in the graveyard, it flips into the Voracious Reader, which has the Prowess mechanic and also makes Instants and Sorceries cast by its controller cost one less generic mana

5) Vinsmoke Reiju (Blue/Purple) Reiju is very much on the rise after Two Legends released, with several Foxy Pirates upgrades added to the deck in 5,000 Year in the Future (and several timely bans) turning her into one of the fastest decks in the format

So she'll stream out 2/1s for free when you cast stuff of those pair as long as you control her

Now Theoden did offer some potential perhaps for solo mono- where you have to do everything with one deck

Related The Mind Sculptor is a particularly infamous Jace Planeswalker, with the ability to remove an opponents entire deck from the game