If a monster is Special Summoned from your opponent's Extra Deck, while this card is in your GY (except during the Damage Step): You can Set this card, but banish it when it leaves the field
"The Pokemon TCG", or even "PTCG")
Another small but useful detail: if you finish Gold or higher in both Constructed and Limited, you do not get duplicate copies of the same card style
This leaves players often forced to resort to their own creativity, using unconventional cards to solve problems that in other cases would be easily solved simply by adding mana sources of other colors
For example, "Manga Ryu-Ran", whose Japanese name was ("Toon Dragon Egger"), is a "Toon" card, but the "Toon" archetype was not supported until the release of "Toon Table of Contents" 3 years after its first print
That said, even without support, Insight Engine is worth your time if you can manage to activate it three or more times