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Short answer

When every card you play bounces their creatures and spells back to their hand, the game is as good as won

By the next set, Planar Chaos , there were already variations on this idea, and by Future Sight , the end of the Time Spiral block, you could see all kinds of Echo costs: red creatues could require you to pay black mana, cheap creatures to cast could end up being expensive later on, and Echo could even be something completely different than mana: Echo Discard a card. The possibilities that this little change opened up were incredible, and the Time Spiral block saw some really interesting Echo designs because of it

She's a 4/4 human monk with a lot of juicy text (more about Tifa's kick-ass abilities in a bit!)