This creature assigns no combat damage this combat
All-stars for this strategy include Everflowing ChaliceEverflowing Chalice, which turns cards into a permanent store of mana, Strength of the TajuruStrength of the Tajuru, which you can split any number of ways to add up to a kill, Verdeloth the AncientVerdeloth the Ancient, which can make an arbitrary amount of tokens, and Josu Vess, Lich KnightJosu Vess, Lich Knight, because have you ever seen anyone play that card
Being able to steal an opponent's creature, block with it, and then sacrifice it gives players an incredible advantage
Vengevine is nuts in decks built around it but those decks are generally on the fair side
As the cards in this list are colorless, you can use them with any commander and study what they can offer you and your deck