Mana Echoes [Onslaught] Commander's Arsenal that land doesn't untap during

that land doesn't untap during its controller's next untap step

Remove a mining counter from Gemstone Mine: Add one mana of any color

you gain twice that much life instead

sacrifice Season of the Witch unless you pay 2 life

Set: Dominaria Prerelease Promos Type: Legendary Artifact Rarity: Mythic Cost: {0} {T}: Add one mana of any color among legendary creatures and planeswalkers you control

Mana Echoes [Onslaught] Commander's Arsenal that land doesn't untap duringSet: Onslaught Type: Enchantment Rarity: Rare Cost: {2}{R}{R} Whenever a creature enters the battlefield, you may add an amount of {C} equal to the number of creatures you control that share a creature type with it. When the ground is saturated with mana, even the lightest footstep can bring it to the surface.