Kuribohrn (AC19-EN014) [Advent Calendar 2019]

At the end of the Battle Phase: You can discard this card, then target 1 monster in your GY that was destroyed by battle and sent there this turn; Special Summon it. When an opponent's monster declares an attack: You can banish this card from your GY, then target any number of "Kuriboh" monsters in your GY; Special Summon them.