Aleister the Invoker (SHVA-EN040) [Shadows in Valhalla]

During either player's turn: You can send this card from your hand to the Graveyard, then target 1 Fusion Monster you control; it gains 1000 ATK and DEF until the end of this turn. If this card is Normal Summoned or flipped face-up: You can add 1 "Invocation" from your Deck to your hand.