Whenever a creature card is put into an opponent's graveyard from anywhere, you gain 1 life.

Whenever you cast an instant or sorcery spell, each opponent loses 1 life. You may cast Rona, Sheoldred's Faithful from your graveyard by discarding two cards in addition to paying its other costs.

Read ahead (Choose a chapter and start with that many lore counters. Add one after your draw step. Skipped chapters don't trigger. Sacrifice after III.) I — You may sacrifice a creature. If you do, each opponent discards a card. II — Return target creature card from your graveyard to your hand. III — Target opponent may sacrifice a nonland, nontoken permanent. If they don't, they lose 2 life and you draw a card.

Kicker {2}{B} (You may pay an additional {2}{B} as you cast this spell.) Return target creature or planeswalker you don't control to its owner's hand. If this spell was kicked, put that permanent on the bottom of its owner's library instead.

({T}: Add {B}.)