Necrotic Hex

Each player sacrifices six creatures of their choice. You create six tapped 2/2 black Zombie creature tokens.

Sanitarium Skeleton

{2}{B}: Return Sanitarium Skeleton from your graveyard to your hand.

Unsummon

Return target creature to its owner's hand.

Mana Geode

When Mana Geode enters, scry 1.
{T}: Add one mana of any color.

Idol of Endurance

When Idol of Endurance enters, exile all creature cards with mana value 3 or less from your graveyard until Idol of Endurance leaves the battlefield.
{1}{W}, {T}: Until end of turn, you may cast a creature spell from among cards exiled with Idol of Endurance without paying its mana cost.