
As long as you control exactly one creature, that creature gets +3/+1 and has lifelink.
Homicidal Seclusion has 1 printing, first in Avacyn Restored (2012). EDHREC ranks it #26,333 among Commander cards. It appears most in Shauku, Endbringer decks (103 on EDHREC).
Deck counts from EDHREC.
Cards that show up in the same decks on EDHREC.