What Essence Sliver does is separate the two instances of combat damage and then the life gain
Cards ask you to tell a player a fact about yourself that you can make up, require someone else to rate something from one to five, and there's "an outside assistance card where the person assisting doesn't even know"
Its basically the Magic communitys quick way of saying no matter how scary a creature looks, you can still take it out with cheap removal, if it doesnt offer any value right away
They originally began as a series of cards before The Eye of Timaeus cemented it as a true archetype with its numerous Fusion Monsters, though The Eye of Timaeus is not a Dark Magician card itself
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There is also the ability for your Trainer Card to reach various different Star Ranks depending on your progres