Cavern of Souls [The List] Avatar // Sorcery you may tap or untap

you may tap or untap target permanent

Sacrifice Windswept Heath: Search your library for a Forest or Plains card

Set: Summer Magic / Edgar Type: Enchantment Rarity: Rare Cost: {1}{R}{R} Blue creatures don't untap during their controllers' untap steps

then draw cards equal to the number of cards named Accumulated Knowledge in all graveyards

or they can gain cards during the game that provide them with resources for future building

Cavern of Souls [The List] Avatar // Sorcery you may tap or untapSet: The List Type: Land Rarity: Rare As Cavern of Souls enters the battlefield, choose a creature type. {T}: Add {C}. {T}: Add one mana of any color. Spend this mana only to cast a creature spell of the chosen type, and that spell can't be countered.