Primarily both are played as a two drop that draws a card, the elf is just a body to be done away with via Skullclamps etc or offer up synergy for better elves where as the wall is more of a speedbump against aggressive decks
10 Sacrifice The most popular build for Muldrotha, the Gravetide, sacrifice decks does exactly that: sacrifice cards to build a graveyard for her to pull from
Bodyguard allows the card to enter play exerted - rotating it 90 degrees to the side, which opens it up to possible challenges - in order to force the opponent to challenge the bodyguard card if they attack on the next turn
We got a few other cool cards in this 99, like Rose, Cutthroat RaiderRose, Cutthroat Raider
Its simple and effective abilities encourages players to take risks and rewards them with vital card draw advantage
It gives your commanders Protection from everything at instant speed