Diamond City
This land enters with a shield counter on it. (If it would be dealt damage or destroyed, remove a shield counter from it instead.) {T}: Add {C}. {T}: Move a shield counter from this land onto target creature. Activate only if two or more creatures entered the battlefield under your control this turn.
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Official rulings (6) · Scryfall
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.
Shield counters don’t prevent players from sacrificing permanents.
Removing a shield counter when a permanent would be dealt damage or destroyed isn’t the same as regenerating a permanent.
“Shield” is not an ability that permanents have and shield counters are not keyword counters. If a permanent with a shield counter loses its abilities, the shield counter will still protect it as normal.
A creature with a shield counter on it may still be destroyed by state-based actions if it has damage marked on it equal to its toughness or has been dealt unpreventable damage by a source with deathtouch.
If a permanent with a shield counter is dealt unpreventable damage, that damage will be dealt and a shield counter will still be removed.