Narrower cards, known as "whist-sized" or "bridge-sized" cards, probably first appeared in Europe and enabled players to handle the larger numbers of cards required for games like bridge
Dina's an engine in and of herself, with an ability that allows you to draw a card once per turn when you sacrifice a creature, and another where you tap her and pay two mana to sacrifice a creature
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Aetherize is another option for this kind of effect, though returning creatures to hand is much less impactful
Crown Zenith's nearly $100 Booster Bundle blows most others out of the water, and you can expect these prices to become normalized for sets that go out of print
Usually, an Alternative Art deviates from the standard art style within a set