Fear of Failed Tests

a Nightmare enters the battlefield — 151 cards in the game can cause this (Fear of Failed Tests is one).

1. Umbris, Fear Manifest — When Fear of Failed Tests enters, Umbris, Fear Manifest exiles a card from an opponent's library

an enchantment is cast — 3,673 cards in the game can cause this (Fear of Failed Tests is one).

When Fear of Failed Tests is cast:

1. Hallowed Haunting — makes a token
2. Daxos the Returned — puts a counter on a permanent
3. Tatsunari, Toad Rider — makes a token
4. Sythis, Harvest's Hand — gains you 1 life
5. Sigil of the Empty Throne — makes a token
6. Dawnhart Geist — gains you 2 life
7. Herald of the Pantheon — gains you 1 life
8. Kami of Transience — puts a +1/+1 counter on itself
9. Argothian Enchantress — draws you 1 card
10. Mesa Enchantress — draws you 1 card

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

a nontoken enchantment enters the battlefield — 3,691 cards in the game can cause this (Fear of Failed Tests is one).

1. Historian's Boon — When Fear of Failed Tests enters, Historian's Boon makes a token

an enchantment enters the battlefield — 3,743 cards in the game can cause this (Fear of Failed Tests is one).

When Fear of Failed Tests enters:

1. Calix, Guided by Fate — puts a counter on a creature
2. Elvish Archivist — draws you 1 card
3. Victor, Valgavoth's Seneschal — surveils
4. Strength from the Fallen — gives +X/+X, where X is the number of creature cards in your graveyard
5. Doomwake Giant — shrinks a creature by -1/-1
6. Cacophony Unleashed — turns something into a creature
7. Ghostly Dancers — makes a token
8. Thassa's Devourer — mills a card
9. Killian, Decisive Mentor — taps a creature
10. Thoughtrender Lamia — makes an opponent discard a card

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

a card is drawn — 3,815 cards in the game can cause this (Fear of Failed Tests is one).

When Fear of Failed Tests makes a player draw a card:

1. Teferi's Tutelage — mills a card
2. Temmet, Naktamun's Will — gives +1/+1
3. Niv-Mizzet, Parun — deals 1 damage
4. Aether Syphon — mills a card
5. The Locust God — makes a token
6. Starving Revenant — makes each opponent lose 1 life
7. Diviner's Wand — gets +1/+1
8. Ominous Seas — puts a foreshadow counter on itself
9. Dream Trawler — gets +1/+0
10. Iron Man, Armored Avenger — puts a counter on a creature

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

anything attacks — 17,934 cards in the game can cause this (Fear of Failed Tests is one).

When Fear of Failed Tests attacks:

1. Within Range — makes each opponent lose life
2. Sparring Regimen — puts a counter on a creature
3. Far Fortune, End Boss — deals 1 damage
4. Campsite Cuisine — sacrifices a Food
5. Obsessive Pursuit — makes you lose life
6. Invisible Woman — triggers
7. Caesar, Legion's Emperor — sacrifices a creature
8. Guide of Souls — triggers
9. Gossip's Talent — triggers
10. Banon, the Returners' Leader — draws and discards

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

a creature attacks — 17,934 cards in the game can cause this (Fear of Failed Tests is one).

When Fear of Failed Tests attacks:

1. Adaptive Omnitool — searches a library
2. Anthem of Rakdos — gives +2/+0
3. Kindred Discovery — draws you 1 card
4. Invasion of New Capenna // Holy Frazzle-Cannon — puts counters on a permanent
5. Chorale of the Void — brings a card back
6. Saw — sacrifices a creature

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

a creature blocks — 17,934 cards in the game can cause this (Fear of Failed Tests is one).

1. Tide of War — When Fear of Failed Tests blocks, Tide of War sacrifices a creature

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

a creature is cast — 18,010 cards in the game can cause this (Fear of Failed Tests is one).

When Fear of Failed Tests is cast:

1. Primeval Bounty — makes a token
2. Communal Brewing — it arrives with counters thanks to Communal Brewing

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

a creature enters the battlefield — 19,800 cards in the game can cause this (Fear of Failed Tests is one).

When Fear of Failed Tests enters:

1. Pollywog Prodigy — puts a counter on itself
2. Airbender Ascension — puts a quest counter on itself
3. Slash, Reptile Rampager — deals 2 damage
4. Ray Fillet, Wave Warrior — puts a counter on itself
5. The Neutrinos — gets +1/+0
6. Wingnut, Bat on the Belfry — grants flying, haste and menace
7. Aetherstorm Roc — puts a counter on a permanent you control
8. Raphael, Most Attitude — exiles a card from your library

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

anything enters the battlefield — 26,499 cards in the game can cause this (Fear of Failed Tests is one).

1. Prowl, Stoic Strategist // Prowl, Pursuit Vehicle — When Fear of Failed Tests enters, Prowl, Stoic Strategist // Prowl, Pursuit Vehicle puts a +1/+1 counter on itself

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