Spike Feeder [Friday Night Magic 2002] PR Does 20 damage plus 20

Does 20 damage plus 20 more damage for each basic Energy attached to Swampert ex but not used to pay for this attack's Energy cost

Set: Legends Type: World Enchantment Rare Cost: {2}{R}{R} No more than two creatures can attack each combat

Set: Commander 2013 Type: Legendary Creature — Giant Soldier Rarity: Mythic Cost: {3}{W}{U}{B} At the beginning of your upkeep

Set: Mystery Booster Type: Enchantment Rarity: Rare Cost: {1}{R} Cumulative upkeep—Add {R}

Spike Feeder [Friday Night Magic 2002] PR Does 20 damage plus 20Set: Friday Night Magic 2002 Type: Creature Spike Rarity: Rare Cost: {1}{G}{G} Spike Feeder enters the battlefield with two +1 +1 counters on it. {2}, Remove a +1 +1 counter from Spike Feeder: Put a +1 +1 counter on target creature. Remove a +1 +1 counter from Spike Feeder: You gain 2 life.