Aleister the Invoker of Madness (SHVA-EN020) [Shadows in Valhalla]

2 monsters with different Types and Attributes
<br>This card's name becomes "Aleister the Invoker" while on the field or in the GY. If a Fusion Monster is Fusion Summoned: You can discard 1 card, and if you do, add 1 "Invocation" or "The Book of the Law" from your Deck to your hand. If this face-up card in its owner's control leaves the field because of an opponent's card effect: You can add 1 "Omega Summon" from your Deck to your hand.