Burn from Within deals X damage to any target. If a creature is dealt damage this way, it loses indestructible until end of turn. If that creature would die this turn, exile it instead.
Quote from jknott85 »You're trying to compare apples to oranges. Indestructible and regenerate, while being similar, operate on two very different axes. Regenerate tends to have an activation cost, while indestructible is a static effects. There should be ways to get around static effects.
Quote from rejuvenile_30 »such awkward text. so do ulamog 1 with this. then a bone splinters it to exile it lol. i think there will be some number of missed exile triggers for other non indestructible creatures off this card too.