Dwynen's Elite's ability checks at the moment it would trigger to see if you control another Elf. If you don't, the ability won't trigger at all. If it does trigger, the ability will check again as it tries to resolve. If you don't control another Elf at that time, the ability won't resolve and none of its effects will happen.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.