In Yu-gi-oh I got Blue Eyes White Dragon 1st edition from LOB (Legend of Blue Eyes) Is it hard to get in a booster? In Pokémon I got all cards from Base set 1, including Charizard which is rare, but rarest is the one from 1st edition and I don't have that one.
In YGO I got Exodia The Forbidden One, but it is promo, not the one from a booster pack.
In Lord of the Rings, if any one here plays it, I got The Witch King foil. I had to trade good cards for that one, but its fun to have.
Gor 3 or 4 Rayquaza EX from EX Dragon, got the three legendary birds ex promo from a metallic box. Got Birthday Pikachuu, a promo, I don't know how rare it is. And I have Ancient Mew, that card with rune writing, but it was common when it was new.