Halfdane

anything attacks — 9,697 cards in Halfdane's colors can cause this (Halfdane is one).

When Halfdane attacks:

1. Temmet, Naktamun's Will — draws you 1 card
2. Grim Javelineer — gives +1/+0
3. ED-E, Lonesome Eyebot — puts a quest counter on itself
4. Surgical Suite // Hospital Room — puts a counter on a creature
5. Fire Navy Trebuchet — makes a token
6. Madame Web, Clairvoyant — mills a card
7. Apothecary White — makes a token
8. Clavileño, First of the Blessed — turns something into a creature
9. Guide of Souls — triggers
10. Gossip's Talent — triggers

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

a creature attacks — 9,697 cards in Halfdane's colors can cause this (Halfdane is one).

When Halfdane attacks:

1. Adaptive Omnitool — searches a library
2. Kindred Discovery — draws you 1 card
3. Invasion of New Capenna // Holy Frazzle-Cannon — puts counters on a permanent
4. Chorale of the Void — brings a card back
5. Screaming Swarm — mills a card
6. Imperious Mindbreaker — mills a card
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. Super-Soldier Serum — triggers

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

a creature blocks — 9,697 cards in Halfdane's colors can cause this (Halfdane is one).

When Halfdane blocks:

1. Mage Hunters' Onslaught — makes a player lose 1 life
2. Barrow-Blade — strips abilities
3. Noble Stand — gains you 2 life
4. Battle Cry — gives +0/+1
5. Dead-Iron Sledge — kills a creature
6. Dwindle — kills a creature
7. Shield of the Righteous — triggers

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

a nontoken creature attacks — 9,697 cards in Halfdane's colors can cause this (Halfdane is one).

When Halfdane attacks:

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

a creature deals combat damage — 9,697 cards in Halfdane's colors can cause this (Halfdane is one).

When Halfdane deals combat damage:

1. Locutus of Borg — makes a token
2. Antagonist Incorporator — makes a token
3. Hive Mind Coprocessor — makes you lose life

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

a creature is cast — 9,734 cards in Halfdane's colors can cause this (Halfdane is one).

When Halfdane is cast:

1. Endrek Sahr, Master Breeder — makes that spell's mana value tokens
2. God-Eternal Oketra — makes a token
3. Oketra's Monument — makes a token
4. Skittering Horror — sacrifices itself
5. Skittering Skirge — sacrifices itself
6. Skittering Monstrosity — sacrifices itself
7. Oltec Matterweaver — triggers
8. Pure Reflection — kills a Reflection
9. Abigale, Poet Laureate // Heroic Stanza — becomes prepared
10. Flickering Hound — flickers a creature you control

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

a nontoken creature enters the battlefield — 10,080 cards in Halfdane's colors can cause this (Halfdane is one).

When Halfdane enters:

1. Angelic Sell-Sword — makes a token
2. Arni, Humble Scribe — untaps itself
3. Spirit Bonds — makes a token
4. Metastatic Evangel — proliferates
5. Minion Reflector — makes a token
6. Blessed Sanctuary — makes a token
7. Radiant Solar — triggers
8. Anafenza, Kin-Tree Spirit — puts a counter on a permanent
9. Overburden — triggers

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

a creature enters the battlefield — 10,850 cards in Halfdane's colors can cause this (Halfdane is one).

When Halfdane enters:

1. Ray Fillet, Wave Warrior — puts a counter on itself
2. Pollywog Prodigy — puts a counter on itself
3. Lunarch Veteran // Luminous Phantom — gains you 1 life
4. Pious Evangel // Wayward Disciple — gains you 1 life
5. Daxos, Blessed by the Sun — gains you 1 life
6. Elas il-Kor, Sadistic Pilgrim — gains you 1 life
7. Loran, Disciple of History — brings a card back
8. Aetherstorm Roc — puts a counter on a permanent you control

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

anything enters the battlefield — 15,308 cards in Halfdane's colors can cause this (Halfdane is one).

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

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