Unsummon

Return target creature to its owner's hand.

Quagmire Druid

{G}, {T}, Sacrifice a creature: Destroy target enchantment.

{X}: Crypt Rats deals X damage to each creature and each player. Spend only black mana on X.

You may tap or untap target artifact, creature, or land.

Charcoal Diamond enters tapped.
{T}: Add {B}.

Geothermal Crevice enters tapped.
{T}: Add {R}.
{T}, Sacrifice Geothermal Crevice: Add {B}{G}.

Tap all lands target player controls and that player loses all unspent mana.

Shivan Oasis enters tapped.
{T}: Add {R} or {G}.

Destroy target nonblack creature. It can't be regenerated.
Draw a card.

Return target creature card from your graveyard to your hand.

Target creature can't block this turn.
Draw a card.

Enchant permanent
You control enchanted permanent.

{T}: Add one mana of any color that a land an opponent controls could produce.

Target opponent reveals their hand. You choose a card from it. That player discards that card.