Source (Modal Double-Faced Cards (MDFCs) - Permanents/Spells - "The final category is interestingly what we had planned to do with the MDFCs in the first place—mix instants and sorceries with a permanent so you can squeeze more instants and sorceries into your deck. Each was designed to work synergistically in the same deck. There is a six-card cycle at rare, with each college getting one MDFC, as well as a colorless one. [...]")
Les deux cartes Syphon Mind et Syphon Soul, de l'édition Onslaught, forment une paire. En fait la première est une référence à la seconde, sachant que Syphon Soul est parue à l'origine dans l'édition Legends.
Source (Regent Cycle - "This rare Dragon cycle was a lot looser than some of the other Dragon cycles. [...] This cycle definitely leaned more toward the build-around.")