Green Mana Battery [Fourth Edition] SM152 Whenever Witch-Maw Nephilim attacks

Whenever Witch-Maw Nephilim attacks

Set: Sword & Shield: Evolving Skies Type: Colorless Rarity: Uncommon Retreat cost: Colorless

You may reveal a reply posted today with a guess and a card you own from outside the game with the same name as that guess

Set: Khans of Tarkir Type: Creature — Human Berserker Rarity: Common Cost: {W} {3}{R}: Firehoof Cavalry gets +2/+0 and gains trample until end of turn

Set: Expedition: Base Set Type: Supporter Rarity: Uncommon

Green Mana Battery [Fourth Edition] SM152 Whenever Witch-Maw Nephilim attacksSet: Fourth Edition Type: Artifact Rarity: Rare Cost: {4} {2}, {T}: Put a charge counter on Green Mana Battery. {T}, Remove any number of charge counters from Green Mana Battery: Add {G}, then add an additional {G} for each charge counter removed this way.