Tatyova, Benthic Druid > Hydroid KrasisBenalish Marshal > Ranger-Captain of EosAshcloud Phoenix > Rekindling PhoenixWarden of the First Tree > Crashing FootfallsMulch > Winding WayMutagenic Growth > Blossoming DefenseDimir House Guard > Yawgmoth, Thran PhysicianRepeal > Phantasmal ImageValorous Stance > Winds of AbandonOutpost Siege > Experimental Frenzy

Modern Horizons Upgrades

Disenchant > Nature's ChantViscera Seer > Carrion FeederAzorius Charm > Unsettled MarinerGrand Arbiter Augustin IV > SoulherderSearing Blaze > Tectonic ReformationPrecursor Golem > Ilharg, the Raze-BoarConcentrate > Fact or FictionWhisperwood Elemental > GenesisWatcher for TomorrowRansack the LabScour All Possibilities

Ral has been the worst of the cube planeswalkers for a long time; Saheeli acts as redundancy for Young Pyro with some occasional upside.
Ral Zarek > Saheeli, Sublime Artificer

The top 3 changes are basically just more efficient/playable cards that fill the same role. The bottom two are attempts to make Orzhov more appealing - replacing Ayli with a solid cheap exile effect for cube bombs and the very slow Blood Baron with an interesting tokens/aggro combo card.
Coralhelm Commander > PteramanderRattleclaw Mystic > Paradise DruidKrosan Grip > Return to NatureBlood Baron of Vizkopa > Cruel CelebrantAyli, Eternal Pilgrim > Despark

Sigarda, Heron's Grace > Trostani Discordant

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