Wording on this card is slightly different than others, is it meant to be a requirement to get rid of it? I ask because it says “must” instead of “may”. If this is the case, is first player to act obligated to discard the 2 cards or can you wait until the last player for the turn?
You may choose to wait as long as you want to destroy Obsidian Field. You could leave it out all game. Any play may choose to discard two cards to get rid of it - the “must” indicates that two card must be discarded for Obsidian Field to be destroyed.
And yet, on all other environment cards that have the same requirement for destruction, it’s worded similar to “1 player may discard {insert number here} card(s) to destroy this card”