The triggered ability will copy the spell that caused it to trigger even if that spell has been countered by the time that ability resolves
Here's what those terms mean: Expansion: These are the regular Magic: The Gathering sets, legal in Standard, and released at regular intervals throughout the year
There a ton of other cards from the set that are seeing high levels of play, including Necrodominance, Warren Soultrader, Phyrexian Tower, Flare of Denial, Flare of Malice, Toxic Deluge, Fanatic of Rhonas, Consign to Memory, Arena of Glory...honestly, I could keep going, but it's not really necessary
However, that owner will be under another player's control, so that player controlling that owner actually makes the decision
You flip this card over, and your reward is a recreation of the iconic fight