Gauntlet of Might [Unlimited Edition] IDW Comics 2014 if Nether Shadow is in

if Nether Shadow is in your graveyard with three or more creature cards above it

Set: Stronghold Type: Artifact Rarity: Rare Cost: {3} Creatures with power greater than the number of cards in your hand can't attack

Other Elves have shroud

the player can activate mana abilities only if they're from lands that player controls and only if mana they produce is spent to activate other mana abilities of lands the player controls and/or to play that card

sacrifice Groundbreaker

Gauntlet of Might [Unlimited Edition] IDW Comics 2014 if Nether Shadow is inSet: Unlimited Edition Type: Artifact Rarity: Rare Cost: {4} Red creatures get +1 +1. Whenever a Mountain is tapped for mana, its controller adds an additional {R}.