Mox Opal [Modern Masters 2015] Goblin Artificer Might Type: Artifact Rarity: Rare

Might Type: Artifact Rarity: Rare Cost: {5} Each creature gets +1/+1 for each other creature on the battlefield that shares at least one creature type with it

Set: Judge Gift Cards 2009 Type: Land Rarity: Rare {T}

Then that player loses all unspent mana and you add the mana lost this way

that many plus one of each of those kinds of counters are put on that permanent instead

Mox Opal [Modern Masters 2015] Goblin Artificer Might Type: Artifact Rarity: RareSet: Modern Masters 2015 Type: Legendary Artifact Rarity: Mythic Cost: {0} Metalcraft {T}: Add one mana of any color. Activate only if you control three or more artifacts. The suns of Mirrodin have shone upon perfection only once.