It's a solid creature because sacrificing creatures is often a specialty of devil, red, and Rakdos decks
Circle of Protection: Red (T1, Ext, S, Block) The highest-ranking color hoser on this list -- and the most enduring of all
Creature - Wolf Color tag templates(None) Rot Wolf Infect (This creature deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.) Whenever a creature dealt damage by Rot Wolf this turn dies, you may draw a card
, : Search your library for a basic land card, put it onto the battlefield tapped, then shuffle
This makes playing the card an eternal mana sink
But as an added benefit, you can play it as an awesome spell