As far as ramp goes, mono-color decks benefit greatly from Caged Sun, and I always try to find room for Jet Medallion if possible
Modal double-faced cards (MDFCs) These are the ones where you choose which face to cast or play (spell on one side, land on the other, etc.)
Leyline of Vitality Leyline of Vitality is great for lifegain decks
Jin-Gitaxias, Progress Tyrant Abundance mentality Jin-Gitaxias, Progress Tyrant is a seven-mana mono-Blue 5/5 with a chunk of text: "Whenever you cast an artifact, instant, or sorcery spell, copy that spell
In this case, Epic Struggle is your win condition, and cards like Folk Medicine and Symbiotic Deployment help you get there
You know exactly which set the cards are from