Kunoros, Hound of Athreos
Legendary Creature — Dog
Vigilance, menace, lifelink
Creature cards in graveyards can't enter the battlefield.
Players can't cast spells from graveyards.
Three sharp barks announce an attempt to escape the Underworld. Three sharp bites end it.
Illustrated by
Theros Beyond Death#222RareEnglishLegality
Rulings
Players can still play lands from graveyards if an effect allows them to do so.
If an effect exiles a card from a graveyard and allows a player to cast it, that player may do so. The spell is cast from exile, not a graveyard.
Look at the card as it exists in your graveyard to determine whether it can enter the battlefield. For example, Sculpting Steel (a noncreature card in the graveyard) can be put onto the battlefield as a copy of a creature, but Phyrexian Metamorph (a creature card in the graveyard) can’t be put onto the battlefield, even if it would copy a noncreature artifact. A Theros Beyond Death God creature card can’t be put onto the battlefield regardless of your devotion to its colors.