Roon of the Hidden Realm

a creature is exiled — 569 cards in Roon of the Hidden Realm's colors can cause this (Roon of the Hidden Realm is one).

1. Soulherder — When a creature is exiled thanks to Roon of the Hidden Realm, Soulherder puts a +1/+1 counter on itself

a Soldier creature enters the battlefield — 931 cards in Roon of the Hidden Realm's colors can cause this (Roon of the Hidden Realm is one).

1. Veteran's Armaments — When Roon of the Hidden Realm enters, Veteran's Armaments triggers

a nontoken creature leaves the battlefield — 1,979 cards in Roon of the Hidden Realm's colors can cause this (Roon of the Hidden Realm is one).

1. Dual Nature — When a creature leaves the battlefield thanks to Roon of the Hidden Realm, Dual Nature exiles a creature

a creature leaves the battlefield — 2,003 cards in Roon of the Hidden Realm's colors can cause this (Roon of the Hidden Realm is one).

1. Valor of the Worthy — When a creature leaves the battlefield thanks to Roon of the Hidden Realm, Valor of the Worthy makes a token

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

a creature attacks — 9,882 cards in Roon of the Hidden Realm's colors can cause this (Roon of the Hidden Realm is one).

When Roon of the Hidden Realm attacks:

1. Adaptive Omnitool — searches a library
2. Kindred Discovery — draws you 1 card
3. The Earth King — searches a library
4. Screaming Swarm — mills a card
5. Imperious Mindbreaker — mills a card
6. Staff of Titania — makes a token
7. Glory Bearers — gives +0/+1
8. Saw — sacrifices a creature
9. Ultima Weapon — kills a creature an opponent controls
10. Super-Soldier Serum — triggers

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

anything attacks — 9,882 cards in Roon of the Hidden Realm's colors can cause this (Roon of the Hidden Realm is one).

When Roon of the Hidden Realm attacks:

1. ED-E, Lonesome Eyebot — puts a quest counter on itself
2. Surgical Suite // Hospital Room — puts a counter on a creature
3. Madame Web, Clairvoyant — mills a card
4. Apothecary White — makes a token
5. Bonny Pall, Clearcutter — draws you 1 card
6. Guide of Souls — triggers
7. Campsite Cuisine — sacrifices a Food
8. Gossip's Talent — triggers
9. Toph, Earthbending Master — puts a counter on a permanent
10. Dyadrine, Synthesis Amalgam — triggers

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

a creature blocks — 9,882 cards in Roon of the Hidden Realm's colors can cause this (Roon of the Hidden Realm is one).

When Roon of the Hidden Realm blocks:

1. Barrow-Blade — strips abilities
2. Favor of the Woods — gains you 3 life
3. Gift of the Woods — gives +0/+3
4. Noble Stand — gains you 2 life
5. Noxious Assault — puts a counter on a permanent
6. Battle Cry — gives +0/+1
7. Ferocity — puts a counter on a permanent
8. Dead-Iron Sledge — kills a creature
9. Dwindle — kills a creature
10. Shield of the Righteous — triggers

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

a nontoken creature attacks — 9,882 cards in Roon of the Hidden Realm's colors can cause this (Roon of the Hidden Realm is one).

When Roon of the Hidden Realm attacks:

1. Basri Ket — makes a token
2. Militia's Pride — makes a token

a creature deals combat damage — 9,882 cards in Roon of the Hidden Realm's colors can cause this (Roon of the Hidden Realm is one).

1. Antagonist Incorporator — When Roon of the Hidden Realm deals combat damage, Antagonist Incorporator makes a token

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

a creature is cast — 9,920 cards in Roon of the Hidden Realm's colors can cause this (Roon of the Hidden Realm is one).

When Roon of the Hidden Realm is cast:

1. God-Eternal Oketra — makes a token
2. Champions of the Perfect — draws you 1 card
3. Primeval Bounty — makes a token
4. Dancing from Dark to Dawn — puts that spell's mana value counters on a creature
5. Summon: Fenrir — it arrives with counters thanks to Summon: Fenrir

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

a creature enters the battlefield — 10,967 cards in Roon of the Hidden Realm's colors can cause this (Roon of the Hidden Realm is one).

1. Lunarch Veteran // Luminous Phantom — When a creature enters thanks to Roon of the Hidden Realm, Lunarch Veteran // Luminous Phantom gains you 1 life
2. Ray Fillet, Wave Warrior — When Roon of the Hidden Realm enters, Ray Fillet, Wave Warrior puts a counter on itself
3. Legolas Greenleaf — When Roon of the Hidden Realm enters, Legolas Greenleaf puts a counter on a permanent
4. Shadow Puppeteers — When Shadow Puppeteers enters thanks to Roon of the Hidden Realm, it makes 2 tokens
5. Sygg, Wanderwine Wisdom // Sygg, Wanderbrine Shield — When Sygg, Wanderwine Wisdom // Sygg, Wanderbrine Shield enters thanks to Roon of the Hidden Realm, it grants a keyword
6. Aetherstorm Roc — When a creature enters thanks to Roon of the Hidden Realm, Aetherstorm Roc puts a counter on a permanent you control
7. Elite Scaleguard — When Elite Scaleguard enters thanks to Roon of the Hidden Realm, it puts a counter on a permanent
8. Long River Lurker — When Long River Lurker enters thanks to Roon of the Hidden Realm, it triggers

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

anything enters the battlefield — 15,547 cards in Roon of the Hidden Realm's colors can cause this (Roon of the Hidden Realm is one).

1. Prowl, Stoic Strategist // Prowl, Pursuit Vehicle — When a creature enters thanks to Roon of the Hidden Realm, Prowl, Stoic Strategist // Prowl, Pursuit Vehicle puts a +1/+1 counter on itself
2. SP//dr, Piloted by Peni — When SP//dr, Piloted by Peni enters thanks to Roon of the Hidden Realm, it puts a counter on a creature
3. Mu Yanling, Wind Rider — When Mu Yanling, Wind Rider enters thanks to Roon of the Hidden Realm, it makes a token
4. Ellivere of the Wild Court — When Ellivere of the Wild Court enters thanks to Roon of the Hidden Realm, it makes a token
5. Haliya, Ascendant Cadet — When Haliya, Ascendant Cadet enters thanks to Roon of the Hidden Realm, it puts a counter on a creature
6. Nazahn, Revered Bladesmith — When Nazahn, Revered Bladesmith enters thanks to Roon of the Hidden Realm, it searches a library
7. Aang, Airbending Master — When Aang, Airbending Master enters thanks to Roon of the Hidden Realm, it triggers
8. Aang, at the Crossroads // Aang, Destined Savior — When Aang, at the Crossroads // Aang, Destined Savior enters thanks to Roon of the Hidden Realm, it puts a creature onto the battlefield
9. Ultimecia, Temporal Threat — When Ultimecia, Temporal Threat enters thanks to Roon of the Hidden Realm, it taps a creature an opponent controls
10. Spider-Man 2099, Miguel O'Hara — When Spider-Man 2099, Miguel O'Hara enters thanks to Roon of the Hidden Realm, it triggers

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