while Yugo is oblivious, Yuri is a Card-Carrying Villain who greately enjoys Starve Venom's penchant for violence, and Yuya and Yuto are more often than not apprehensive about having more than one dragon or their fused forms on the field because they're afraid of what they will do under their influence
Having the ability to cycle is important enough to turn a fringe-playable card all the way up to third place in my Amonkhet set review, so I guess that shows how important I have found cycling to be early in my Standard testing
It puts any Artifact on the board for free, thus letting their effects activate if used during the opponent's turn
A new feature, the Fusion Shop, allows two cards to be combined into a single new card, or simply exchange unneeded cards to increase a Partner card's EXP
They haven't been used too often, usually appearing as "one-off" mechanics in most sets
Cyber Jar