Nightmares and Daydreams (TLE-094) - Avatar: The Last Airbender: Eternal-Legal

(As this Saga enters and after your draw step, add a lore counter.
Sacrifice after IV.)

[I] [II] [III] Until your next turn, whenever you cast an instant or sorcery spell, target player mills cards equal to that spell's mana value.

[IV] Draw a card. If a graveyard has twenty or more cards in it, draw three cards instead.