If I happen to have Nissa's Chosen in play and it dies, then there are two relevant replacement effects: Stone of Erechs (that would exile it instead of letting it go to the graveyard), and Nissa's Chosens own replacement effect (that would tuck it back into my library)

27 Description Specs Reviews Find in Store Features FINAL FANTASY VII-THEMED DECK- Battle your friends with FINAL FANTASY VII's iconic heroes, villains and spells with the strategic gameplay of the Magic: The Gathering collectible card game LET'S MOSEY- Get into gear with Cloud, Ex-SOLDIER and fight for the planet's future as you equip weapons and raise your creature stats to 7 power or higher to break past your limit 25 NEW CARDS + ALL NEW ART- All 100 cards in this ready-to-play deck feature new FINAL FANTASY-themed art, including 25 Commander cards entirely new to Magic: The Gathering 2 FOIL LEGENDARY CARDS- Each deck includes 2 Legendary Creature cards with a shiny Traditional Foil treatment that can be played as your commander COLLECT SPECIAL ALT-BORDER CARDS- Each deck also comes with a 2-card Collector Booster Sample Pack containing 2 alternate-border cards of rarity Rare or higher, at least 1 of which is a shining Traditional Foil EPIC MULTIPLAYER BATTLES- Magic: The Gathering's most popular play format, Commander is a multiplayer way to play Magic, an epic, free-for-all battle full of strategic plays and social intrigue for 3-5 players The Limit Break deck features cards themed around FINAL FANTASY VII

The commander you control doesn't have to be your commander
That said, it might be sometimes good if you have a big amount of Hell Mongrel
Best White Look at Hand Cards #4
Give Commander players even more reason to not run Phyrexian Arena ever again