A 3/6 with Menace and Deathtouch that can draw you cards and remove counters from permanents, enabling you to transform any other Battles in your deck easily
See rule 711.3
For those Magic players who have also been around a while, I was partially inspired by the card Tolsimir Wolfblood who was first introduced in Ravnica: City of Guilds , Holt said
Depending on what is on your board at the time, this can close out an entire game, dealing damage to an opponent by combat to then kill them with Vito, Thorn Of The Dusk Rose's main effect
In a 1v1 format like Standard, giving your opponent a card so you can use the creature right away is a downside, but this blue enchantment from Bloomburrow creates the opportunity for lucrative political deals in Commander
Because Carmen cares about permanents , not just creatures , you can set up fantastic value engines where you sacrifice cards like Ichor Wellspring away and get them back to outdraw your opponents