Ragnar

a Human enters the battlefield — 2,624 cards in Ragnar's colors can cause this (Ragnar is one).

1. Heronblade Elite — When Ragnar enters, Heronblade Elite puts a +1/+1 counter on itself
2. Kyler, Sigardian Emissary — When Ragnar enters, Kyler, Sigardian Emissary puts a +1/+1 counter on itself
3. Thalia's Lieutenant — When Ragnar enters, Thalia's Lieutenant puts a +1/+1 counter on itself
4. Champion of the Parish — When Ragnar enters, Champion of the Parish puts a +1/+1 counter on itself
5. Captain of the Mists — When Ragnar enters, Captain of the Mists untaps itself
6. Beregond of the Guard — When Ragnar enters, Beregond of the Guard gives +1/+1
7. Dawnhart Disciple — When Ragnar enters, Dawnhart Disciple gets +1/+1
8. Lossarnach Captain — When Ragnar enters, Lossarnach Captain taps a creature an opponent controls

a creature attacks — 9,882 cards in Ragnar's colors can cause this (Ragnar is one).

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

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

anything attacks — 9,882 cards in Ragnar's colors can cause this (Ragnar is one).

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

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

a creature blocks — 9,882 cards in Ragnar's colors can cause this (Ragnar is one).

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

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

a nontoken creature attacks — 9,882 cards in Ragnar's colors can cause this (Ragnar is one).

1. Basri Ket — When Ragnar attacks, Basri Ket makes a token
2. Militia's Pride — When Ragnar attacks, Militia's Pride makes a token

a creature deals combat damage — 9,882 cards in Ragnar's colors can cause this (Ragnar is one).

1. Antagonist Incorporator — When Ragnar 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 Ragnar's colors can cause this (Ragnar is one).

1. Primeval Bounty — When Ragnar is cast, Primeval Bounty makes a token
2. Dancing from Dark to Dawn — When Ragnar is cast, Dancing from Dark to Dawn puts that spell's mana value counters on a creature
3. Summon: Fenrir — When Ragnar is cast, it arrives with counters thanks to Summon: Fenrir
4. Torens, Fist of the Angels — When Ragnar is cast, Torens, Fist of the Angels makes a token
5. God-Eternal Oketra — When Ragnar is cast, God-Eternal Oketra makes a token
6. Silk, Web Weaver — When Ragnar is cast, Silk, Web Weaver makes a token
7. Selvala, Eager Trailblazer — When Ragnar is cast, Selvala, Eager Trailblazer makes a token
8. Silverback Elder — When Ragnar is cast, Silverback Elder triggers
9. Oltec Matterweaver — When Ragnar is cast, Oltec Matterweaver triggers
10. Pure Reflection — When Ragnar is cast, Pure Reflection kills a Reflection

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

a nontoken creature enters the battlefield — 10,129 cards in Ragnar's colors can cause this (Ragnar is one).

1. Samwise Gamgee — When Ragnar enters, Samwise Gamgee makes a token
2. Dual Nature — When Ragnar enters, Dual Nature makes a token
3. Angelic Sell-Sword — When Ragnar enters, Angelic Sell-Sword makes a token
4. Arni, Humble Scribe — When Ragnar enters, Arni, Humble Scribe untaps itself
5. Lonis, Cryptozoologist — When Ragnar enters, Lonis, Cryptozoologist triggers

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

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

1. Ray Fillet, Wave Warrior — When Ragnar enters, Ray Fillet, Wave Warrior puts a counter on itself
2. Legolas Greenleaf — When Ragnar enters, Legolas Greenleaf puts a counter on a permanent
3. Aetherstorm Roc — When Ragnar enters, Aetherstorm Roc puts a counter on a permanent you control

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

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

1. Prowl, Stoic Strategist // Prowl, Pursuit Vehicle — When Ragnar enters, Prowl, Stoic Strategist // Prowl, Pursuit Vehicle puts a +1/+1 counter on itself

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