People use the singular "they" all the time conversationally, and as language changes, the rules of proper usage have relaxed enough that we're comfortable switching to it now
With different etchings in the text-box frame depending on the element being depicted, this treatment complements the artwork of the series beautifully
Temper (When the combat chain closes, if this defended, put a -1 [Defense] counter on it, then if it has 0 [Defense], destroy it.)
I say probably because Wizards of the Coast has been cagey with details, and much of what we know comes from scant press release missions and Blake Rasmussens comments from the latest Weekly MTG YouTube video
Then if there are three or more ribbon counters on this creature, remove those counters and untap it