Dream Chisel (0) Artifact Face-down creature spells you cast cost less to cast.
Helm of Awakening (0) Artifact Spells cost less to cast.
Locket of Yesterdays (0) Artifact Spells you cast cost less to cast for each card with the same name as that spell in your graveyard.
Cloud Key (1) Artifact As this enters the battlefield, choose artifact, creature, enchantment, instant, or sorcery. Spells you cast of the chosen type cost less to cast.
Sapphire Medallion (1) Artifact Blue spells you cast cost less to cast.
Stone Calendar (2) Artifact Spells you cast cost up to less to cast.
Fluctuator (2) Artifact Cycling abilities you activate cost you up to less to activate.
Heartstone (2) Artifact Activated abilities of creatures cost less to activate. This effect can't reduce the amount of mana an ability costs to activate to less than one mana.
Urza's Incubator (3) Artifact As this enters the battlefield, choose a creature type. Creature spells of the chosen type cost less to cast.
Power Artifact (2) Enchantment — Aura Enchant artifact Enchanted artifact's activated abilities cost less to activate. This effect can't reduce the amount of mana an ability costs to activate to less than one mana.
Mana Matrix (3) Artifact Instant and enchantment spells you cast cost up to less to cast.
Planar Gate (3) Artifact Creature spells you cast cost up to less to cast.
Urza's Filter (3) Artifact Multicolored spells cost up to less to cast.
Etherium Sculptor (2) Artifact Creature — Vedalken Artificer (1/2) Artifact spells you cast cost less to cast.
Krosan Drover (5) Creature — Elf (2/2) Creature spells you cast with converted mana cost 6 or more cost less to cast.