Arcum Dagsson [Coldsnap] Wraith You may cast it without

You may cast it without paying its mana cost if it's a creature spell that shares a creature type with a creature you control

"What else

Set: Time Spiral Timeshifted Type: Creature — Merfolk Rarity: Rare Cost: {U}{U} Other Merfolk get +1/+1 and have islandwalk

Set: The Dark Type: Enchantment Rarity: Rare Cost: {B}{B}{B} At the beginning of your upkeep

Titania is ascendant

Arcum Dagsson [Coldsnap] Wraith You may cast it withoutSet: Coldsnap Type: Legendary Creature Human Artificer Rarity: Rare Cost: {3}{U} {T}: Target artifact creature's controller sacrifices it. That player may search their library for a noncreature artifact card, put it onto the battlefield, then shuffle their library. "Artifice sundered the world. It shall not again wreak such sorrow."