30 cards where the illustration contains “skull-helmet”

Bolrac-Clan Basher (Murders at Karlov Manor #112)
Chainwhip Cyclops (War of the Spark #118)
Chaos Lord (Ice Age #178)
Clan Guildmage (Ravnica Allegiance #162)
Corpse Augur (Commander 2015 #17)
Dark Ritual (Secret Lair Drop #1170)
Demonlord of Ashmouth (Avacyn Restored #96)
Fault Riders (Prophecy #88)
Grave Titan (Duels of the Planeswalkers 2012 Promos #2)
Gruul War Chant (Dragon's Maze #75)
Hedgewitch's Mask (Innistrad: Midnight Hunt #23)
Ignoble Hierarch (Modern Horizons 2 #166)
Jarad, Golgari Lich Lord (Duel Decks: Izzet vs. Golgari #45)
Kalitas, Traitor of Ghet (Oath of the Gatewatch #86)
Kargan Dragonrider (Core Set 2019 #297)
Mindstatic (Dragon's Maze #14)
Mist of Stagnation (Judgment #48)
Mogis's Marauder (Theros #97)
Nogi, Draco-Zealot (Game Night: Free-for-All #4)
Ogre Shaman (Exodus #91)
Pardic Miner (Odyssey #212)
Pianna, Nomad Captain (Odyssey #39)
Reverse Polarity (Antiquities #7)
Sek'Kuar, Deathkeeper (Commander 2013 #210)
Shaman of Forgotten Ways (Dragons of Tarkir #204)
Skarrgan Hellkite (Ravnica Allegiance #114)
Skarrg Guildmage (Gatecrash #196)
Tattoo Ward (Odyssey #54)
Torture (Homelands #59b)
Tuknir Deathlock (Legends #267)

The orcs’ banner sends a clear message: “You've reached the end of this search.”