Garbage Elemental (3/1 Creature) [Unstable] Phyrexian Zombie you may pay {0} rather

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

"Origins of Kholon"

The Patriarch dreams of vile plague

Set: Deckmasters Type: Sorcery Rarity: Common Cost: {X}{R} Lava Burst deals X damage to any target

Garbage Elemental (3/1 Creature) [Unstable] Phyrexian Zombie you may pay {0} ratherSet: Unstable Type: Creature Elemental Rigger Rarity: Uncommon Cost: {4}{R} When Garbage Elemental enters the battlefield, it assembles a Contraption. (Put the top card of your Contraption deck face up onto one of your sprockets.) Undying (When this creature dies, if it had no +1 +1 counters on it, return it to the battlefield under its owner's control with a +1 +1 counter on it.)