Grindstone [Tempest] Horror Spirit Athreos isn't a creature

Athreos isn't a creature

Set: Weatherlight Type: Creature — Human Rarity: Rare Cost: {2}{W} At the beginning of your upkeep

Set: Ixalan Prerelease Promos Type: Artifact // Land Rarity: Rare Cost: {4} Instant and sorcery spells you cast cost {1} less to cast

flowing with waters more ancient than the world itself

Set: Tempest Type: Enchantment Rarity: Rare Cost: {2}{G}{G} Any player may cast creature spells with mana value 3 or less without paying their mana costs and as though they had flash

Grindstone [Tempest] Horror Spirit Athreos isn't a creatureSet: Tempest Type: Artifact Rarity: Rare Cost: {1} {3}, {T}: Target player mills two cards. If two cards that share a color were milled this way, repeat this process. "Memory is a burden that wears at the soul as weather wears at stone." Crovax