Riza, First of the Dead (BFA-074) [Battle for Attoractia]

[Stealth] You control four or more magic stones, you control a darkness magic stone, and no resonators. (While this card is in your chant-standby area, you may play it without paying its cost when its [Stealth] condition is met.) When this card enters your field, you may pay 1000 life. If you do, search your main deck for a card and put it into your chant-standby area face down. Then shuffle your main deck.