Urborg [Legends] Cleric Knight Heroic — Whenever you cast

Heroic — Whenever you cast a spell that targets Battlefield Thaumaturge

Set: Ixalan Treasure Chest Type: Artifact — Equipment Rarity: Rare Cost: {2} When Dowsing Dagger enters the battlefield

You may cast it without paying its mana cost

Set: Rivals of Ixalan Type: Legendary Creature — Elder Dinosaur Rarity: Mythic Cost: {6}{R}{G}{W} Vigilance

But sometimes

Urborg [Legends] Cleric Knight Heroic — Whenever you castSet: Legends Type: Legendary Land Rarity: Uncommon {T}: Add {B}. {T}: Target creature loses first strike or swampwalk until end of turn. "Resignedly beneath the sky The melancholy waters lie. So blend the turrets and shadows there That all seem pendulous in air, While from a proud tower in town Death looks gigantically down." Edgar Allan Poe, "The City in the Sea"