Chaos 4

[On Play] If you have at least 4 Activated Energy cards with "Emerald" in their name; return 2 units your opponent controls to the hand. For every card returned, discard 1 random card from your opponent's hand.
[Your Turn] If you control at least 6 Activated Energy cards with "Emerald" in their name; You may K.O. this unit to play a "Chaos 6" from your hand or discard pile without paying the cost.
[Once per Turn] When an Energy card with "Emerald" in its name is Activated; Return 1 unit with "Guardian"