Vodalian Zombie [Invasion] Elder Giant Dog you may pay 0 rather

you may pay 0 rather than pay the mana cost for a spell you cast with converted mana cost X or less

Set: Commander Masters Type: Sorcery Rarity: Uncommon Cost: {4}{G} Reveal the top five cards of your library

Set: Kaldheim Type: Enchantment Rarity: Rare Cost: {1}{W} As Rally the Ranks enters the battlefield

Set: Collectors' Edition Type: Basic Land — Swamp Rarity: Common ({T}: Add {B}

Vodalian Zombie [Invasion] Elder Giant Dog you may pay 0 ratherSet: Invasion Type: Creature Merfolk Zombie Rarity: Common Cost: {U}{B} Protection from green "Every last one of you will become my servant. It's a shame you won't live to see the irony." Tsabo Tavoc, Phyrexian general