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Source: mtgazone.com

Energy Cost The amount and type of Energy that you need to have attached to a Pokmon in order to have it use a given attack

Having access to repeatable cheap GY hate was crucial during longer games, where the graveyard was the waiting room between board wipes

(1) Special Summon 1 Level 4 or lower Fish, Sea Serpent or Aqua monster from your hand or GY, and if you do, you cannot Special Summon from the Extra Deck while you control it, except Xyz Monsters

Good examples of echo are Mogg War Marshal and Stingscourger, where you have to pay the echo cost to keep the creature one turn after youve cast it