Its something thats been going on in paper since foils were first introduced, and although its going to happen more often now and be less cool when it pops up, its not going to break anything
When another face-up Dragon monster(s) you control returns to your hand (except during the Damage Step): You can target 1 monster your opponent controls
Magician of Black Chaos MAX Ritual Spell: Chaos Form This card splashes amazingly into any deck that can ritual summon during your opponents turn (looking at you, Megaliths)
Nightmare Factory Plane: Nozgorod At the beginning of your upkeep, put a soot counter on Nightmare Factory
The Power Nine are a relic of a brief time when card design was unfettered by concerns of balance against other sets, and their abilities are truly exceptional as a result
Manaforge Cinder: a good way to solve early game mana screw of a specific color, especially early in a Limited game