Fix the common failure: Add lands, add draw, add answers, lower curve, add redundancy
Ricardo Silva Efficiency is often key in Modern, and Inquisition of Kozilek fits in very well in such a format
In Pioneer, Copy Cat represents a turn-four combo kill, and if you can make the mana work, a turn one Gilded Goose will potentially get you there a turn sooner
When a Siege is defeated, it is exiled, and its owner gets to play the reverse side (which could be a Creature, Artifact, or some other MTG card type) for free at Instant speed.
In the Past, Everything was Cheaper Back then, a full set of CE/IE cards roughly cost $50, so people rebacked their gold-bordered cards so they could be played with their black-bordered cards