Many depict supporting characters of varying levels of importance, including beloved mentors such as Rafiki from The Lion King
That being said, an additional three mana to flash this card back from your graveyard is a lot to ask for most aggressive strategies that want a keyword like haste
This is almost exclusively only good with tokens
Where Swords to Plowshares represented the exiled creature going off to be a farmer, Marriage of Convenience would've represented the exiled creature getting married off
But they have been known to share that bounty around a little, and even within those colors, the idea of returning a card from graveyard to play has a staggering amount of depth
For one, it's the first to name check a specific character, that being the tentacled sea-witch herself, who's been freed from imprisonment and is wreaking her usual havoc upon Lorcana