Family's Favor

Shield counters don't prevent players from sacrificing creatures.

If a permanent that would be dealt damage has more than one shield counter on it, that damage is prevented and only one shield counter is removed.

If the attacking creature loses its last shield counter at the same time it deals combat damage to a player (for example, if the attacking creature has trample and would be dealt damage by a blocker), then you will not be able to pay the cost of removing a counter when the triggered ability resolves.

Neither the triggered ability that puts a shield counter on a target attacking creature nor the triggered ability that removes a shield counter from it are optional.