Rika, Queen of Curses

Partner with Yuta Okkotsu, The Prodigy (When this creature enters, target player may put Yuta into their hand from their library, then shuffle.)

At the beginning of combat on your turn, create a Cursed Energy token. (It's an artifact with {2}, {t}, Sacrifice this token: You gain 3 life.")

Activated abilities of Cursed Energy you control cost {1} less to activate.