Raiden, Lightning Wielder

When Raiden, Lightning Wielder enters the battlefield you get {e}{e}{e}{e}{e}{e}
{e}{e}{e}{e}{e}{e}{e}{e}{e}{e}{e}{e}{e}{e}
(twenty energy counters).
When Raiden, Lightning Wielder attacks you may pay X X energy counters. At the end of combat deal X damage to each blocking creature.