destroy all monsters your opponent controls with the same Type as that monster sent to the Graveyard
Yes, if youre running a deck that uses the graveyard or you dont want to pay the Commander Tax, you can pop the creature into the graveyard until youre ready to exhume it
As a small aside, while Im generally a proxy advocate, my goal here isnt to tell you whether proxies are good or bad for Magic, just to inform you of the most acceptable places to play them
EOE introduced some powerhouse cards to Magic, including Cosmogrand Zenith, Ouroboroid, and Quantum Riddler, all of which have been making waves in Constructed formats
Pokmon , Magic: The Gathering , and Yu-Gi-Oh
Overall, the weakness of this archetype is that their monsters, except their Xyz Monsters, focus heavily on their own archetype, so it's best to not add too many non-"Constellar" monsters