Celestial Armor
Artifact — Equipment
Flash
When this Equipment enters, attach it to target creature you control. That creature gains hexproof and indestructible until end of turn.
Equipped creature gets +2/+0 and has [[ keyword: "flying" ]].
Equip 
Olena Richards
Foundations (FDN)
• #5Rulings
If a creature gains hexproof in response to a spell or ability controlled by an opponent that only targets that creature, then when that spell or ability tries to resolve, all of its targets will be illegal. As a result, that spell or ability won't resolve and none of its effects will happen.
(wotc • 2024-11-08)
Attaching Celestial Armor to a creature that has already been blocked won't cause it to become unblocked, even if one or more of the blocking creatures don't have flying or reach.
(wotc • 2024-11-08)
Printings
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Rulings
If a creature gains hexproof in response to a spell or ability controlled by an opponent that only targets that creature, then when that spell or ability tries to resolve, all of its targets will be illegal. As a result, that spell or ability won't resolve and none of its effects will happen.
(wotc • 2024-11-08)
Attaching Celestial Armor to a creature that has already been blocked won't cause it to become unblocked, even if one or more of the blocking creatures don't have flying or reach.
(wotc • 2024-11-08)