They can draw you a lot of cards in theory, but how often is this going to be better than the identically costed Divination or Counsel of the Soratami in the abstract (which for most multiplayer deck decisions is where your deck-building must go)
Additionally, the Archenemy only needs 10 scheme cards in their deck, instead of the usual 20
In addition to a regular planeswalker art and borderless planeswalker version of Ajani before becoming Phyrexianized, we have included a Phyrexian art, a borderless Phyrexian art, and a Phyrexian-language variant of Ajani
Other notable Ruby cards are Honest John Not That Honest, who has an ability that costs opponents 1 Lore whenever his player brings a Floodborn character in play, and Queen of Hearts Sensing Weakness, which has a powerful draw effect and is a Floodborn character, meaning that players can bring it out relatively quick into the game
I see Conjurers Closet on quite a few of these decklists
UW11_XR 2W Instant You gain life equal to the damage dealt by target creature this turn