mtg the walking dead cards —Eugene Porter Replacing the Walking Dead :

1 in 8 Murders at Karlov Manor Play Boosters (12.5%) features a card from Special Guests or The List instead of the seventh common card

This is the shell for it

The good news is, that ability is good on lots of board states

Prereleases are great because the set is totally new, the footing is fairly equal as everybody plays with the set for the very first time, and you're all just relaxing and having fun exploring the new cards

Seedglaive Mentor One generic, one red, one white creature Mouse Soldier 3/2 Uncommon Vigilance, haste Valiant Whenever Seedglaive Mentor becomes the target of a spell or ability you control for the first time each turn, put a +1/+1 counter on it