Hallow

damage is prevented — 568 cards in the game can cause this (Hallow is one).

When Hallow has damage prevented:

1. Phyrexian Vindicator — deals that much damage
2. Selfless Squire — puts that many +1/+1 counters on itself
3. New Way Forward — deals that much damage
4. Samite Ministration — gains you that much life
5. Judgment of Alexander — deals its power damage

life is gained — 2,076 cards in the game can cause this (Hallow is one).

When Hallow gains life:

1. Dina, Soul Steeper — makes each opponent lose 1 life
2. Marina Vendrell's Grimoire — draws you that many cards
3. South Wind Avatar — makes each opponent lose 1 life
4. Rodolf Duskbringer — grants indestructible
5. Fiendish Panda — puts a +1/+1 counter on itself
6. Veinwitch Coven — brings a card back
7. Cleric Class — puts a counter on a creature
8. Lich's Mastery — draws you that many cards
9. Wall of Limbs — puts a +1/+1 counter on itself
10. Ratchet, Field Medic // Ratchet, Rescue Racer — triggers

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

an instant is cast — 3,931 cards in the game can cause this (Hallow is one).

1. Lunar Mystic — When Hallow is cast, Lunar Mystic draws you 1 card
2. Ojer Pakpatiq, Deepest Epoch // Temple of Cyclical Time — When Hallow is cast, Ojer Pakpatiq, Deepest Epoch // Temple of Cyclical Time grants rebound
3. Repeated Reverberation — When Hallow is cast, Repeated Reverberation copies an ability
4. Riku of Two Reflections — When Hallow is cast, Riku of Two Reflections copies a spell
5. Sword of Wealth and Power — When Hallow is cast, Sword of Wealth and Power copies a spell
6. Lilah, Undefeated Slickshot — When Hallow is cast, Lilah, Undefeated Slickshot gets +1/+1
7. Gale, Waterdeep Prodigy — When Hallow is cast, Gale, Waterdeep Prodigy brings a card back
8. Harness the Storm — When Hallow is cast, Harness the Storm brings a card back
9. In the Eye of Chaos — When Hallow is cast, In the Eye of Chaos counters a spell
10. Niblis of Frost — When Hallow is cast, Niblis of Frost taps a creature an opponent controls

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

anything is cast — 31,128 cards in the game can cause this (Hallow is one).

1. Windrider Wizard — When Hallow is cast, Windrider Wizard draws you 1 card
2. Relic Amulet — When Hallow is cast, Relic Amulet puts a charge counter on itself
3. Rockslide Sorcerer — When Hallow is cast, Rockslide Sorcerer deals 1 damage
4. Umara Wizard // Umara Skyfalls — When Hallow is cast, Umara Wizard // Umara Skyfalls grants flying
5. Alania, Divergent Storm — When Hallow is cast, Alania, Divergent Storm makes an opponent draw 1 card
6. Umara Mystic — When Hallow is cast, Umara Mystic gets +2/+0
7. Master of Winds — When Hallow is cast, Master of Winds triggers

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