Whenever a creature enters the battlefield, that creature's controller may have target creature of their choice get -3/-3 until end of turn.

Target creature gets -4/-4 until end of turn.
Cycling (, Discard this card: Draw a card.)
When you cycle Death Pulse, you may have target creature get -1/-1 until end of turn.

Creatures of the creature type of your choice get +0/+4 until end of turn.

Destroy target enchantment.

All creatures gain fear until end of turn. (They can't be blocked except by artifact creatures and/or black creatures.)
Cycling (, Discard this card: Draw a card.)
When you cycle Dirge of Dread, you may have target creature gain fear until end of turn.

Protection from black
Cycling (, Discard this card: Draw a card.)

Protection from white
Cycling (, Discard this card: Draw a card.)

Counter target spell. Look at the top four cards of your library, then put them back in any order.

, Sacrifice a permanent: Return target permanent to its owner's hand.

: Counter target spell unless its controller pays .
Morph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)

Flying
, Sacrifice Dive Bomber: It deals 2 damage to target attacking or blocking creature.

As Doom Cannon enters the battlefield, choose a creature type.
, , Sacrifice a creature of the chosen type: Doom Cannon deals 3 damage to any target.

, , Sacrifice Doomed Necromancer: Return target creature card from your graveyard to the battlefield.

Doubtless One's power and toughness are each equal to the number of Clerics on the battlefield.
Whenever Doubtless One deals damage, you gain that much life.

: Create a 5/5 red Dragon creature token with flying. (It can't be blocked except by creatures with flying or reach.)

Face-down creature spells you cast cost less to cast.

, : Destroy target nonbasic land.
Morph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)

Whenever Ebonblade Reaper attacks, you lose half your life, rounded up.
Whenever Ebonblade Reaper deals combat damage to a player, that player loses half their life, rounded up.
Morph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)

Elven Riders can't be blocked except by Walls and/or creatures with flying.

Enchant land
Whenever enchanted land is tapped for mana, its controller adds an additional for each Elf on the battlefield.