Older cards don't have a set code so, you need to know the symbol for each set to be able to tell on-sight, but a quick search over on Gatherer can help you out when youre not sure
A split card's characteristics are a combination of its two halves while it is not on the stack
The small black star with the '1' inside, located below the illustration, confirms it is indeed a 1st Edition, a characteristic that significantly increases its value compared to unlimited editions
The Eldrazi is a 10/10 that costs 10 mana to cast
Some give flying, deathtouch, +1/+1 counters, hexproof, double strike, vigilance, haste, mana generation, sacrifice abilities, etc
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