Aurification

Whenever a creature deals damage to you, put a gold counter on it. Each creature with a gold counter on it is a Wall in addition to its other creature types and has defender. (Those creatures can't attack.) When this enchantment leaves the battlefield, remove all gold counters from all creatures.

From Magic: The Gathering.

Open the interactive version on https://mythscribe.cloud/app/tcg/cards/cms6oh8acccrppb1hvn0b72hk.