Flying
Whenever Xyru Specter deals damage to an opponent, that player discards a card unless they challenge you. If challenged, and you show them two black cards in your hand, they must discard two cards.
“Summon” isn’t a card type. Xyru Specter is a creature.
12-11-2019
wotc
If you’re challenged, you may reveal any number of cards from your hand. The effect that allowed a player to challenge you will specify what you must reveal to win the challenge.
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.