Debt of Loyalty

A creature with indestructible never needs to regenerate, so Debt of Loyalty will have no effect on it.

Casting Debt of Loyalty puts a regeneration shield on a creature. If, later in the turn, that creature would be destroyed, instead it regenerates and you gain control of it. Note that it will be tapped when you gain control of it. The control change has no duration; you’ll retain control of that creature until the game ends or until some other effect causes it to change control.

If a creature has two regeneration shields on it — one from a Debt of Loyalty you cast and one from another effect — and it would be destroyed, its controller chooses which regeneration shield to use. If that player chooses to use the Debt of Loyalty shield, you’ll gain control of the creature. If the player chooses to use the other shield, you won’t gain control of the creature, but the Debt of Loyalty shield will remain on that creature for the rest of the turn (in case it would be destroyed again).