Ayara, First of Locthwain (Extended Art) [Throne of Eldraine] Instant its controller may discard a

its controller may discard a card that shares a color with that spell

If the player does

Set: Legends Type: Sorcery Rare Cost: {2}{B}{B}{B} Destroy all nonblack creatures

but if it switches it won't be able to switch back

Return it to the battlefield tapped under its owner's control at the beginning of the next end step

Ayara, First of Locthwain (Extended Art) [Throne of Eldraine] Instant its controller may discard aSet: Throne of Eldraine Type: Legendary Creature Elf Noble Rarity: Rare Cost: {B}{B}{B} Whenever Ayara, First of Locthwain or another black creature enters the battlefield under your control, each opponent loses 1 life and you gain 1 life. {T}, Sacrifice another black creature: Draw a card.