
Each opponent who controls more creatures than you can't cast creature spells. The same is true for artifacts and enchantments.
Each opponent who controls more lands than you can't play lands.
Ward of Bones has 4 printings, first in Eventide (2008). EDHREC ranks it #12,405 among Commander cards. It appears most in Belbe, Corrupted Observer decks (268 on EDHREC). It has 1 official ruling.
Deck counts from EDHREC.
Cards that show up in the same decks on EDHREC.