Bonds of Faith
Enchantment — Aura
Enchant creature
Enchanted creature gets +2/+2 as long as it's a Human. Otherwise, it can't attack or block.
"What cannot be destroyed will be bound." —Oath of Avacyn
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The List#DDQ-2CommonEnglishLegality
Rulings
Sep 22, 2011
Once the enchanted creature has been declared as an attacking or blocking creature, causing it to stop being a Human won’t remove it from combat. It will lose the +2/+2 bonus, however.