Mox Opal [Kaladesh Inventions]Set: Kaladesh Inventions Type: Legendary Artifact Rarity: Mythic Cost: {0} Metalcraft {T}: Add one mana of any color. Activate only if you control three or more artifacts. On loan from a private collection, this unique mechanism extracts power from a carefully prepared gemstone.

you may pay [3 Resource] instead

(It's an aura with "When you play an attack action card or attack with a weapon

" —Ancient blessing

Set: Black & White: Legendary Treasures Type: Psychic Rarity: Ultra Rare Retreat cost: Colorless

Set: Diamond & Pearl: Majestic Dawn Type: Fire Rarity: Holo Rare Retreat cost: Colorless

Set: Judge Gift Cards 2003 Type: Instant Rarity: Rare Cost: {2}{U} Search your library for three cards and reveal them

Set: XY: Base Set Type: Fairy Rarity: Ultra Rare Retreat cost: Colorless

Go again Blade Break (If you defend with Perch Grapplers

Whenever you tap a Swamp for mana

Set: Black & White: Dark Explorers Type: Fire Rarity: Promo Retreat cost: Colorless

Nights on Innistrad grow longer

Set: Aquapolis Type: Grass Rarity: Common Retreat cost: Colorless