With a plethora of triggered abilities and permanents that do things when they die, you can start triggering all sorts of cascading and powerful effects
A lot of modern Magic mechanics are parasitic in nature, only playing well with a critical mass of peers
Top candidates include chase cards like Pikachu ex SAR, Charizard ex SAR, and popular character SARs from recent sets
All previously printed plane cards have had an update to their Oracle text to accommodate this change
Devastator's hydra typing makes it a mainstay in Gargos, Vicious Watcher decks, though being green is usually reason enough to slot it into ramp-based strategies
For Ragavan to work, though, he has to deal combat damage to your opponent