Umbris, Fear Manifest

put a Nightmare onto the battlefield — 87 cards in Umbris's colors can cause this.

1. Barkform Harvester — When Barkform Harvester enters, Umbris, Fear Manifest exiles a card from an opponent's library
2. Dreadwing Scavenger — When Dreadwing Scavenger enters, Umbris, Fear Manifest exiles a card from an opponent's library
3. Devourer of Memory — When Devourer of Memory enters, Umbris, Fear Manifest exiles a card from an opponent's library
4. Swimmer in Nightmares — When Swimmer in Nightmares enters, Umbris, Fear Manifest exiles a card from an opponent's library
5. Gibbering Barricade — When Gibbering Barricade enters, Umbris, Fear Manifest exiles a card from an opponent's library
6. Fear of Infinity — When Fear of Infinity enters, Umbris, Fear Manifest exiles a card from an opponent's library
7. Fear of Sleep Paralysis — When Fear of Sleep Paralysis enters, Umbris, Fear Manifest exiles a card from an opponent's library
8. Cruel Somnophage // Can't Wake Up — When Cruel Somnophage // Can't Wake Up enters, Umbris, Fear Manifest exiles a card from an opponent's library
9. Graveshifter — When Graveshifter enters, Umbris, Fear Manifest exiles a card from an opponent's library
10. Nightmare Shepherd — When a Nightmare enters thanks to Nightmare Shepherd, Umbris, Fear Manifest exiles a card from an opponent's library

77 other cards cause it too. These are the ones with the most connections.

a Horror deals combat damage — 262 cards in Umbris's colors can cause this (Umbris is one).

1. Captain N'ghathrod — When Umbris, Fear Manifest deals combat damage, Captain N'ghathrod mills a card

a creature attacks — 6,258 cards in Umbris's colors can cause this (Umbris is one).

When Umbris, Fear Manifest attacks:

1. Adaptive Omnitool — searches a library
2. Kindred Discovery — draws you 1 card
3. Chorale of the Void — brings a card back
4. Screaming Swarm — mills a card
5. Imperious Mindbreaker — mills a card
6. Staff of Titania — makes a token
7. Saw — sacrifices a creature
8. Gisa's Favorite Shovel — makes an opponent sacrifice a creature
9. Ultima Weapon — kills a creature an opponent controls
10. Throwing Knife — sacrifices itself

63 other cards care about it too. These are the ones with the most connections.

anything attacks — 6,258 cards in Umbris's colors can cause this (Umbris is one).

When Umbris, Fear Manifest attacks:

1. Grim Javelineer — gives +1/+0
2. ED-E, Lonesome Eyebot — puts a quest counter on itself
3. Fire Navy Trebuchet — makes a token
4. Madame Web, Clairvoyant — mills a card
5. Dimir Strandcatcher — surveils
6. Stensian Sanguinist // Exsanguinate — grants deathtouch
7. Rev, Tithe Extractor — grants deathtouch
8. Gossip's Talent — triggers
9. Krydle of Baldur's Gate — triggers
10. Alora, Merry Thief — triggers

15 other cards care about it too. These are the ones with the most connections.

a creature blocks — 6,258 cards in Umbris's colors can cause this (Umbris is one).

When Umbris, Fear Manifest blocks:

1. Mage Hunters' Onslaught — makes a player lose 1 life
2. Barrow-Blade — strips abilities
3. Dead-Iron Sledge — kills a creature
4. Dwindle — kills a creature

4 other cards care about it too. These are the ones with the most connections.

a creature deals combat damage — 6,258 cards in Umbris's colors can cause this (Umbris is one).

1. Hive Mind Coprocessor — When Umbris, Fear Manifest deals combat damage, Hive Mind Coprocessor makes you lose life

98 other cards care about it too. These are the ones with the most connections.

a creature is cast — 6,287 cards in Umbris's colors can cause this (Umbris is one).

When Umbris, Fear Manifest is cast:

1. Endrek Sahr, Master Breeder — makes that spell's mana value tokens
2. Oketra's Monument — makes a token
3. Kozilek's Unsealing — makes 2 tokens
4. The Clone Saga — copies a spell
5. Customs Depot — draws you 1 card
6. Skittering Horror — sacrifices itself
7. Skittering Skirge — sacrifices itself
8. Skittering Monstrosity — sacrifices itself
9. Hazoret's Monument — draws and discards
10. Aether Barrier — makes a player sacrifice a permanent

19 other cards care about it too. These are the ones with the most connections.

a nontoken creature enters the battlefield — 6,508 cards in Umbris's colors can cause this (Umbris is one).

When Umbris, Fear Manifest enters:

1. Arni, Humble Scribe — untaps itself
2. Minion Reflector — makes a token
3. Overburden — triggers

3 other cards care about it too. These are the ones with the most connections.

a creature enters the battlefield — 6,953 cards in Umbris's colors can cause this (Umbris is one).

When Umbris, Fear Manifest enters:

1. Ray Fillet, Wave Warrior — puts a counter on itself
2. Ayara, First of Locthwain — makes each opponent lose 1 life
3. Blasting Station — untaps itself
4. Sage of the Falls — draws you 1 card
5. Bloodline Pretender — puts a +1/+1 counter on itself
6. Sage's Row Denizen — mills a card
7. Snarling Gorehound — surveils
8. Monkey Cage — sacrifices itself
9. Tainted Aether — makes a player sacrifice a creature or land
10. Lethal Vapors — kills it

60 other cards care about it too. These are the ones with the most connections.