Moonstone Harbinger

a Bat attacks — 103 cards in the game can cause this (Moonstone Harbinger is one).

1. Zoraline, Cosmos Caller — When Moonstone Harbinger attacks, Zoraline, Cosmos Caller gains you 1 life

a Warrior attacks — 1,319 cards in the game can cause this (Moonstone Harbinger is one).

1. Najeela, the Blade-Blossom — When Moonstone Harbinger attacks, Najeela, the Blade-Blossom makes a token

a Warrior deals combat damage — 1,319 cards in the game can cause this (Moonstone Harbinger is one).

1. Raiders' Spoils — When Moonstone Harbinger deals combat damage, Raiders' Spoils makes you lose life

a Warrior creature enters the battlefield — 1,401 cards in the game can cause this (Moonstone Harbinger is one).

1. Obsidian Battle-Axe — When Moonstone Harbinger enters, Obsidian Battle-Axe triggers

a Warrior enters the battlefield — 1,403 cards in the game can cause this (Moonstone Harbinger is one).

When Moonstone Harbinger enters:

1. Mardu Woe-Reaper — hits a graveyard
2. Thrasher Brute — makes each opponent lose 1 life
3. Decorated Champion — puts a +1/+1 counter on itself

make a player lose life — 3,160 cards in the game can cause this.

1. Brainstealer Dragon — When Brainstealer Dragon makes a player lose life, Moonstone Harbinger gives +1/+0
2. Poisonbelly Ogre — When a player makes a player lose life thanks to Poisonbelly Ogre, Moonstone Harbinger gives +1/+0
3. Wretched Anurid — When Wretched Anurid makes a player lose life, Moonstone Harbinger gives +1/+0
4. Tinybones Joins Up — When Tinybones Joins Up makes a player lose life, Moonstone Harbinger gives +1/+0
5. Trespasser's Curse — When Trespasser's Curse makes a player lose life, Moonstone Harbinger gives +1/+0
6. Carnival of Souls — When Carnival of Souls makes a player lose life, Moonstone Harbinger gives +1/+0
7. Requiem Monolith — When Requiem Monolith makes a player lose life, Moonstone Harbinger gives +1/+0
8. Binding Agony — When Binding Agony makes a player lose life, Moonstone Harbinger gives +1/+0
9. Spiteful Shadows — When a creature makes a player lose life thanks to Spiteful Shadows, Moonstone Harbinger gives +1/+0
10. Ragged Veins — When a player makes a player lose life thanks to Ragged Veins, Moonstone Harbinger gives +1/+0

3,150 other cards cause it too. These are the ones with the most connections.

anything attacks — 17,934 cards in the game can cause this (Moonstone Harbinger is one).

When Moonstone Harbinger attacks:

1. Far Fortune, End Boss — deals 1 damage
2. Temmet, Naktamun's Will — draws you 1 card
3. Grim Javelineer — gives +1/+0
4. Invisible Woman — triggers
5. Caesar, Legion's Emperor — sacrifices a creature
6. Guide of Souls — triggers
7. Campsite Cuisine — sacrifices a Food
8. Gossip's Talent — triggers
9. Banon, the Returners' Leader — draws and discards
10. Toph, Earthbending Master — puts a counter on a permanent

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

a creature attacks — 17,934 cards in the game can cause this (Moonstone Harbinger is one).

When Moonstone Harbinger attacks:

1. Adaptive Omnitool — searches a library
2. Anthem of Rakdos — gives +2/+0
3. Kindred Discovery — draws you 1 card
4. Invasion of New Capenna // Holy Frazzle-Cannon — puts counters on a permanent
5. Chorale of the Void — brings a card back
6. Anim Pakal, Thousandth Moon — puts a +1/+1 counter on itself
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. Total War — kills a creature

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

a creature blocks — 17,934 cards in the game can cause this (Moonstone Harbinger is one).

When Moonstone Harbinger blocks:

1. Mage Hunters' Onslaught — makes a player lose 1 life
2. Carnage Gladiator — makes a player lose 1 life
3. Barrow-Blade — strips abilities
4. Heat of Battle — deals 1 damage
5. Battle Strain — deals 1 damage
6. Favor of the Woods — gains you 3 life
7. Tide of War — sacrifices a creature
8. Dead-Iron Sledge — kills a creature
9. Dwindle — kills a creature
10. Shield of the Righteous — triggers

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

a nontoken creature attacks — 17,934 cards in the game can cause this (Moonstone Harbinger is one).

When Moonstone Harbinger attacks:

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

a creature deals combat damage — 17,934 cards in the game can cause this (Moonstone Harbinger is one).

When Moonstone Harbinger deals combat damage:

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

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

a creature is cast — 18,010 cards in the game can cause this (Moonstone Harbinger is one).

When Moonstone Harbinger 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. Summon: Brynhildr — grants haste
7. Skittering Horror — sacrifices itself
8. Skittering Skirge — sacrifices itself
9. Skittering Monstrosity — sacrifices itself
10. Silverback Elder — triggers

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

a creature enters the battlefield — 19,800 cards in the game can cause this (Moonstone Harbinger is one).

When Moonstone Harbinger enters:

1. Slash, Reptile Rampager — deals 2 damage
2. Ray Fillet, Wave Warrior — puts a counter on itself
3. The Neutrinos — gets +1/+0
4. Wingnut, Bat on the Belfry — grants flying, haste and menace
5. Aetherstorm Roc — puts a counter on a permanent you control
6. Raphael, Most Attitude — exiles a card from your library

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

anything enters the battlefield — 26,499 cards in the game can cause this (Moonstone Harbinger is one).

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

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