Isengard Unleashed

If you resolve two copies of Isengard Unleashed in one turn, damage dealt by sources you control will be multiplied by 9. If you resolve three, it will be multiplied by 27, and so on.

If a creature with trample you control would deal combat damage to a blocking creature this turn, you must assign its unmodified damage. For example, a 3/3 creature with trample blocked by a 2/2 creature can have 1 damage assigned to the defending player. It will then deal 6 damage to the blocking creature (2 tripled) and 3 to the defending player (1 tripled).

If an effect such as that of Chandra's Pyrohelix asks you to divide damage among targets, you must divide the unmodified damage before tripling it.

Protection prevents damage, so protection will be unable to prevent damage after Isengard Unleashed has resolved. However, this won't allow a spell or ability to target illegally, even if that spell or ability would cause damage to be dealt.

"Flashback [cost]" means "You may cast this card from your graveyard by paying [cost] rather than paying its mana cost" and "If the flashback cost was paid, exile this card instead of putting it anywhere else any time it would leave the stack."

A spell cast using flashback will always be exiled afterward, whether it resolves, is countered, or leaves the stack in some other way.