Creatures you control are the chosen type in addition to their other types
Haliya is the latest in a long line of Soul Warden-style effects, except she has the added bonus of gaining you life for each artifact that enters, too
--- ### Life as a Resource Bolass Citadel is powerful but risky

Commander (1) Creature (35) Acererak the Archlich Baleful Strix Barrowin of Clan Undurr Burnished Hart Champion of Wits Cloister Gargoyle Consecrated Sphinx Displacer Beast Doomed Necromancer Elite Instructor Gray Merchant of Asphodel Hama Pashar, Ruin Seeker Karmic Guide Merfolk Looter Mulldrifter Nadaar, Selfless Paladin Obsessive Stitcher Phyrexian Delver Plaguecrafter Priest of Fell Rites Radiant Solar Ravenloft Adventurer Rune-Scarred Demon Sepulchral Primordial Sheoldred, Whispering One Solemn Simulacrum Stitcher's Supplier Sun Titan Syr Konrad, the Grim Thassa's Oracle Veteran Dungeoneer Viscera Seer Wall of Omens White Plume Adventurer Yuan-Ti Malison Instant (4) Cyclonic Rift Despark Swords to Plowshares Utter End Sorcery (5) Buried Alive Demonic Tutor Fates' Reversal Grim Tutor Incarnation Technique Enchantment (4) Ghostly Prison Propaganda Rhystic Study Rooftop Storm Artifact (14) Altar of Dementia Arcane Signet Ashnod's Altar Azorius Signet Dimir Signet Dungeon Map Fellwar Stone Lightning Greaves Mind Stone Orzhov Signet Perpetual Timepiece Phyrexian Altar Sol Ring Wayfarer's Bauble Land (37) Arcane Sanctum Azorius Chancery Choked Estuary Command Tower Contaminated Landscape Darkwater Catacombs Dimir Aqueduct Esper Panorama Evolving Wilds Exotic Orchard Island x6 Nimbus Maze Orzhov Basilica Plains x6 Port Town Prairie Stream Sunken Hollow Swamp x6 Terramorphic Expanse Thriving Heath Thriving Isle Thriving Moor Venture Into the Ending Secret Door | Illustration by Francisco Miyara This card type and keyword are ridiculous, but in the best way

We also took notes on how SQUARE ENIX themselves utilized these characters in their other releases
SPIRITS Innistrad is filled with spirits, called geists, who take the forms of protective ancestors, those lost between life and death, and vengeful creatures