Sheoldred's Terror [Unknown Event] Core Set 2021 You may spend mana as

You may spend mana as though it were mana of any type to cast creature spells

the Ruiner has hexproof if it hasn't dealt damage yet

destroy target nonartifact creature that player controls of their choice

Set: Magic Premiere Shop 2006 Type: Basic Land — Swamp Rarity: Rare ({T}: Add {B}

Set: The Brothers' War Retro Artifacts Type: Artifact Rarity: Mythic Cost: {4} You may look at the top card of your library any time

Sheoldred's Terror [Unknown Event] Core Set 2021 You may spend mana asSet: Unknown Event Type: Instant Rarity: Common Cost: {B} Destroy target creature not originally printed in an Argentum expansion. (Mirrodin, Darksteel, Fifth Dawn, Scars of Mirrodin, Mirrodin Besieged, New Phyrexia, and Phyrexia: All Will be One are Argentum expansions. Argentum is Karn's original name for that plane, now you know!)