Seal of Doom

Sacrifice Seal of Doom: Destroy target nonblack creature. It can't be regenerated.

Fountain of Cho

Fountain of Cho enters tapped.
{T}: Put a storage counter on Fountain of Cho.
{T}, Remove any number of storage counters from Fountain of Cho: Add {W} for each storage counter removed this way.

Endless Scream

Enchant creature
Endless Scream enters with X scream counters on it.
Enchanted creature gets +1/+0 for each scream counter on Endless Scream.

Coalition Honor Guard

While an opponent is choosing targets as part of casting a spell they control or activating an ability they control, that player must choose at least one Flagbearer on the battlefield if able.

Humble

Until end of turn, target creature loses all abilities and has base power and toughness 0/1.

Selenia, Dark Angel

Flying
Pay 2 life: Return Selenia, Dark Angel to its owner's hand.

Fatal Blow

Destroy target creature that was dealt damage this turn. It can't be regenerated.

Swamp

Terror

Destroy target nonartifact, nonblack creature. It can't be regenerated.

Do or Die

Separate all creatures target player controls into two piles. Destroy all creatures in the pile of that player's choice. They can't be regenerated.

Disenchant

Plains

Seal of Cleansing

Sacrifice Seal of Cleansing: Destroy target artifact or enchantment.

Dauthi Marauder

Shadow (This creature can block or be blocked by only creatures with shadow.)

Screams from Within

Enchant creature
Enchanted creature gets -1/-1.
When enchanted creature dies, return Screams from Within from your graveyard to the battlefield.

Akroma's Blessing

Choose a color. Creatures you control gain protection from the chosen color until end of turn.
Cycling {W} ({W}, Discard this card: Draw a card.)

Dauthi Slayer

Shadow (This creature can block or be blocked by only creatures with shadow.)
Dauthi Slayer attacks each combat if able.