Interesting thing with Odric:
Whenever ~ and at least three other creatures attack, you choose which creatures block this combat and how those creatures block.
Remember in Magic, can’t trumps can every time. So if a creature is unblockable on your team or a creature can’t block on their team, Odric can’t be used on those specific creatures in how they block nor can you force an opponent who is not the defending player to block for the defending player.
You can, interestingly enough, choose for the opponent to not block at all, I believe. Someone correct me if I’m wrong. But the idea is to keep killing your opponent’s dudes and establish a nice healthy board presence.