Mycosynth Lattice [Darksteel] Human Barbarian When you attack with three

When you attack with three or more creatures

Set: Unlimited Edition Type: Artifact Rarity: Rare Cost: {0} {T}: Add {G}

Set: Exodus Type: Enchantment Rarity: Rare Cost: {3}{R} Whenever a creature enters the battlefield

Set: Kaladesh Inventions Type: Artifact Rarity: Mythic Cost: {1} As Pithing Needle enters the battlefield

is good enough

Mycosynth Lattice [Darksteel] Human Barbarian When you attack with threeSet: Darksteel Type: Artifact Rarity: Rare Cost: {6} All permanents are artifacts in addition to their other types. All cards that aren't on the battlefield, spells, and permanents are colorless. Players may spend mana as though it were mana of any color.