Nightmares and Daydreams (Avatar: The Last Airbender Eternal)

Enchantment Ñ Saga - (As this Saga enters and after your draw step, add a lore counter. Sacrifice after IV.)
I, II, III Ñ Until your next turn, whenever you cast an instant or sorcery spell, target player mills cards equal to that spell's mana value.
IV Ñ Draw a card. If a graveyard has twenty or more cards in it, draw three cards instead.