If Betrayer's Bargain resolves, its effect causes the creature to be exiled any time it would die that turn, not just if it would die as a result of damage dealt by Betrayer's Bargain
If a card is ever released at a lower rarity in a future MTG Arena release, each of its printings will then require a lower rarity wildcard to craft
It's a one-time use spell, but one that is just as strong as the best card in your opponents graveyard
Exiling any creature is always valuable, and the changeling ability gives it extra synergy in creature typal decks
4 Sword of the Animist There are loads of swords in Magic, and many of them are incredible Sinew and Steel, Hearth and Home, Feast and Famine, the list goes on
Youll much prefer the emblem on Nissa, Vital Force instead, so well replace one with the other and not help the other three players at the table quite so much