Harald, King of Skemfar

an Elf attacks — 522 cards in Harald's colors can cause this (Harald is one).

When Harald, King of Skemfar attacks:

1. Celeborn the Wise — scries
2. Tyvar the Bellicose — grants deathtouch
3. Harald Unites the Elves — shrinks a creature by -1/-1
4. Arboreal Alliance — triggers

a nontoken Elf enters the battlefield — 527 cards in Harald's colors can cause this (Harald is one).

1. Wirewood Hivemaster — When Harald, King of Skemfar enters, Wirewood Hivemaster makes a token

an Elf enters the battlefield — 547 cards in Harald's colors can cause this (Harald is one).

When Harald, King of Skemfar enters:

1. Wolverine Riders — gains you its toughness life
2. Elvish Warmaster — makes a token
3. Elvish Vanguard — puts a +1/+1 counter on itself
4. Marwyn, the Nurturer — puts a +1/+1 counter on itself
5. Woodland Weavemaster — gets +1/+1
6. High Perfect Morcant — puts a counter on a permanent an opponent controls

a Warrior deals combat damage — 462 cards in Harald's colors can cause this (Harald is one).

1. Raiders' Spoils — When Harald, King of Skemfar deals combat damage, Raiders' Spoils makes you lose life

a Warrior creature enters the battlefield — 502 cards in Harald's colors can cause this (Harald is one).

1. Obsidian Battle-Axe — When Harald, King of Skemfar enters, Obsidian Battle-Axe triggers

a Warrior enters the battlefield — 504 cards in Harald's colors can cause this (Harald is one).

When Harald, King of Skemfar enters:

1. Thrasher Brute — makes each opponent lose 1 life
2. Decorated Champion — puts a +1/+1 counter on itself

a creature attacks — 6,618 cards in Harald's colors can cause this (Harald is one).

When Harald, King of Skemfar attacks:

1. Adaptive Omnitool — searches a library
2. Chorale of the Void — brings a card back
3. Staff of Titania — makes a token
4. Fractal Harness — puts counters on a permanent
5. Inquisitorial Rosette — makes a token
6. Wand of Orcus — grants deathtouch
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. Throwing Knife — sacrifices itself

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

anything attacks — 6,618 cards in Harald's colors can cause this (Harald is one).

When Harald, King of Skemfar attacks:

1. Grim Javelineer — gives +1/+0
2. ED-E, Lonesome Eyebot — puts a quest counter on itself
3. Fire Navy Trebuchet — makes a token
4. Hollowmurk Siege — puts a counter on a creature
5. Stensian Sanguinist // Exsanguinate — grants deathtouch
6. Rev, Tithe Extractor — grants deathtouch
7. Boggart Prankster — gives +1/+0
8. Campsite Cuisine — sacrifices a Food
9. Toph, Earthbending Master — puts a counter on a permanent
10. Twins of Discord — triggers

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

a creature blocks — 6,618 cards in Harald's colors can cause this (Harald is one).

When Harald, King of Skemfar blocks:

1. Mage Hunters' Onslaught — makes a player lose 1 life
2. Barrow-Blade — strips abilities
3. Favor of the Woods — gains you 3 life
4. Gift of the Woods — gives +0/+3
5. Noxious Assault — puts a counter on a permanent
6. Ferocity — puts a counter on a permanent
7. Mammoth Harness — grants first strike
8. Dead-Iron Sledge — kills a creature

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

a creature deals combat damage — 6,618 cards in Harald's colors can cause this (Harald is one).

1. Hive Mind Coprocessor — When Harald, King of Skemfar deals combat damage, Hive Mind Coprocessor makes you lose life

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

a creature is cast — 6,648 cards in Harald's colors can cause this (Harald is one).

When Harald, King of Skemfar is cast:

1. Primeval Bounty — makes a token
2. Bloodbond March — brings a card back
3. Dancing from Dark to Dawn — puts that spell's mana value counters on a creature
4. Endrek Sahr, Master Breeder — makes that spell's mana value tokens
5. Summon: Fenrir — it arrives with counters thanks to Summon: Fenrir
6. Mona Lisa, Ever Adaptable — makes a token
7. Skittering Horror — sacrifices itself
8. Skittering Skirge — sacrifices itself
9. Skittering Monstrosity — sacrifices itself
10. Silverback Elder — triggers

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

a nontoken creature enters the battlefield — 6,890 cards in Harald's colors can cause this (Harald is one).

When Harald, King of Skemfar enters:

1. Dual Nature — makes a token
2. Bramble Sovereign — makes a token
3. Soul of the Harvest — draws you 1 card
4. Surrak and Goreclaw — puts a counter on a permanent
5. Warden of the Grove — triggers

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

a creature enters the battlefield — 7,436 cards in Harald's colors can cause this (Harald is one).

1. Legolas Greenleaf — When Harald, King of Skemfar enters, Legolas Greenleaf puts a counter on a permanent

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