💡 Players must apply the regenerate effect before the permanent would die. If a creature is in combat, the last chance to do this is during the declare blockers step, after blockers are declared and before damage. This is referred to as 'giving the creature a regeneration shield'.
💡 Up until The Dark, a creature that could regenerate itself would say 'Regenerates'.
💡 Terror from Limited Edition Alpha is the only instance of the word 'regeneration' appearing in the rules text. 💡 Both Regenerate and Regeneration would provide regeneration effects. However, the Universes Beyond card Time Lord Regeneration does not. 💡 Buried cards couldn't be regenerated.
💡 Four cards - Soldevi Sentry, Debt of Loyalty, Skeleton Scavengers and Matopi Golem - have secondary effects tied to their regeneration effect. Such effects were intended to only occur when regeneration occurs, and as such are the only cards with 'regenerates this way'. Debt of Loyalty is the most confusing as the rules text does not indicate that and reads like a three-mana Mind Control. 💡 The fear, lifelink, manifest dread, regenerate, and vigilance keywords are the only keywords with a card of the exact name: Fear, Lifelink, Manifest Dread, Regenerate, and Vigilance respectively.