51 cards where the card is tagged “synergy-plains”

Abolish (Duel Decks: Elspeth vs. Tezzeret #29)
Airlift Chaplain (The Brothers' War #2)
Ajani's Last Stand (Core Set 2019 #4)
Angelic Favor (Nemesis #1)
Arctic Aven (Magic 2013 #42)
Armored Ascension (Magic 2011 #5)
Castle Ardenvale (Murders at Karlov Manor Commander #253)
Charge Across the Araba (Saviors of Kamigawa #4)
Cho-Arrim Legate (Mercadian Masques #10)
Clifftop Retreat (Outlaws of Thunder Junction Commander #278)
Dire Wolves (Ice Age #230)
Dominaria's Judgment (Planeshift #4)
Duergar Hedge-Mage (March of the Machine Commander #324)
Emeria Shepherd (Zendikar Rising Commander #16)
Emeria, the Sky Ruin (Commander 2014 #293)
Fortified Village (Murders at Karlov Manor Commander #262)
Frontier Seeker (Outlaws of Thunder Junction #13)
Furycalm Snarl (Murders at Karlov Manor Commander #263)
Genju of the Fields (Betrayers of Kamigawa #5)
Glacial Fortress (Ixalan #255)
Gwyllion Hedge-Mage (Commander Anthology #201)
Hedge Troll (Planar Chaos #151)
Idyllic Grange (Throne of Eldraine #246)
Isolated Chapel (Outlaws of Thunder Junction Commander #301)
Karoo (Commander 2014 #303)
Keeper of Progenitus (Shards of Alara #135)
Kjeldoran Outpost (Vintage Masters #301)
Knight of the Reliquary (Iconic Masters #203)
Landbind Ritual (Zendikar #24)
Lashknife (Nemesis #9)
Last Stand (Planechase Anthology #100)
Lay Down Arms (The Brothers' War #11)
Nimbus Maze (Forgotten Realms Commander #252)
Orim's Cure (Mercadian Masques #33)
Plow Through Reito (Saviors of Kamigawa #22)
Port Town (Commander Masters #1019)
Qasali Ambusher (Shards of Alara #184)
Quarry Colossus (Journey into Nyx #22)
Ramosian Rally (Mercadian Masques #38)
Razor Golem (Darksteel #137)
Sejiri Merfolk (Worldwake #36)
Shineshadow Snarl (The Lost Caverns of Ixalan Commander #351)
Sivvi's Ruse (Nemesis #21)
Sivvi's Valor (Nemesis #22)
Spiritual Sanctuary (Legends #38)
Staff of the Sun Magus (Magic 2015 #235)
Sunblade Elf (Magic 2015 #202)
Sunpetal Grove (Ixalan #257)
Tek (Invasion #313)
Valor (Time Spiral Timeshifted #16)
Wild Nacatl (Duel Decks: Ajani vs. Nicol Bolas #4)

The message was clear to Sorin—time to search for something else.