Oskar, Rubbish Reclaimer (Promo Pack) [Streets of New Capenna Commander Promos] Scariest Creature You'll Ever See Set: World Championship Decks 1998

Set: World Championship Decks 1998 Type: Creature — Bird Rarity: Rare Cost: {G} Flying

Set: Dominaria Prerelease Promos Type: Legendary Sorcery Rarity: Rare Cost: {4}{W} (You may cast a legendary sorcery only if you control a legendary creature or planeswalker

Set: Magic Player Rewards 2004 Type: Token Creature — Spirit Rarity: Common

Set: HeartGold & SoulSilver: Undaunted Type: Metal Rarity: Ultra Rare Retreat cost: Colorless

They only specify the consequences should you fail

Oskar, Rubbish Reclaimer (Promo Pack) [Streets of New Capenna Commander Promos] Scariest Creature You'll Ever See Set: World Championship Decks 1998Set: Streets of New Capenna Commander Promos Type: Legendary Creature Human Wizard Rarity: Rare Cost: {3}{U}{B} This spell costs {1} less to cast for each different mana value among cards in your graveyard. Whenever you discard a nonland card, you may cast it from your graveyard. "So many fools think throwing something away is the same as disposing of it."