Refuse // Cooperate [Commander 2019] Legendary Land you may pay {B} rather

you may pay {B} rather than pay this spell's mana cost

Set: Seventh Edition Type: Enchantment Rarity: Uncommon Cost: {2}{B} As Engineered Plague enters the battlefield

Tibalt Type: Sorcery Rarity: Common Cost: {6}{B} Target player loses 4 life and you gain 4 life

but the Izzet wards held and experiments continue

Kiora Type: Sorcery Rarity: Rare Cost: {X}{X}{2}{W}{W} Create X 4/4 white Angel creature tokens with flying

Refuse // Cooperate [Commander 2019] Legendary Land you may pay {B} ratherSet: Commander 2019 Type: Instant Instant Rarity: Rare Cost: {3}{R} {2}{U} Refuse deals damage to target spell's controller equal to that spell's converted mana cost. Reverse Type: Instant Aftermath (Cast this spell only from your graveyard. Then exile it.) Copy target instant or sorcery spell. You may choose new targets for the copy.