Boulderborn Dragon

you surveil — 233 cards in the game can cause this (Boulderborn Dragon is one).

When Boulderborn Dragon surveils:

1. Mirko, Obsessive Theorist — puts a +1/+1 counter on itself
2. Prudent Fateseer // Peer Review — gives +1/+0
3. Diviner of Victory // Unwind History — gets +1/+1
4. Saheeli, Consul of Oversight — makes a token
5. Copy Catchers — makes a token
6. Proft, Consulting Detective — puts a +1/+1 counter on itself
7. Matoya, Archon Elder — draws you 1 card
8. Denzilore Fatehold — puts a counter on a creature
9. Whispering Snitch — deals 1 damage
10. Blood Operative — makes you lose life

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

a Dragon attacks — 474 cards in the game can cause this (Boulderborn Dragon is one).

When Boulderborn Dragon attacks:

1. Silumgar, the Drifting Death — shrinks a creature by -1/-1
2. Utvara Hellkite — makes a token
3. The Ur-Dragon — draws you that many cards
4. Atarka, World Render — grants double strike
5. Kolaghan, the Storm's Fury — gives +1/+0
6. Invasion of Tarkir // Defiant Thundermaw — deals 2 damage
7. Ojutai, Soul of Winter — taps a creature, artifact, enchantment, planeswalker or battle an opponent controls
8. Dromoka, the Eternal — puts a counter on a permanent

a Dragon deals combat damage — 474 cards in the game can cause this (Boulderborn Dragon is one).

When Boulderborn Dragon deals combat damage:

1. Parapet Thrasher — triggers
2. Broodcaller Scourge — puts a permanent onto the battlefield
3. Zurgo and Ojutai — triggers

a nontoken Dragon enters the battlefield — 484 cards in the game can cause this (Boulderborn Dragon is one).

When Boulderborn Dragon enters:

1. Lathliss, Dragon Queen — makes a token
2. Miirym, Sentinel Wyrm — makes a token

a Dragon it applies enters with counters to — 488 cards in the game can cause this.

1. Dragonstorm Globe — Dragonstorm Globe gives Boulderborn Dragon counters as it enters

487 other cards cause it too. These are the ones with the most connections.

a Dragon enters the battlefield — 524 cards in the game can cause this (Boulderborn Dragon is one).

When Boulderborn Dragon enters:

1. Dragon Tempest — deals damage
2. Bloomvine Regent // Claim Territory — gains you 3 life
3. Sarkhan, Dragon Ascendant — puts a +1/+1 counter on itself
4. Ganax, Astral Hunter — makes a token
5. Scourge of Valkas — deals damage
6. Bladewing's Thrall — returns itself from the graveyard
7. Sarkhan, Soul Aflame — copies a permanent
8. Teeming Dragonstorm — triggers
9. Corroding Dragonstorm — triggers
10. Roiling Dragonstorm — triggers

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

an artifact attacks — 1,243 cards in the game can cause this (Boulderborn Dragon is one).

When Boulderborn Dragon attacks:

1. Alibou, Ancient Witness — deals X damage
2. Bio-Asset Allocator — makes each opponent lose 1 life
3. Assaultron Dominator — puts a counter on a permanent
4. Aloy, Savior of Meridian — triggers

an artifact deals combat damage — 1,243 cards in the game can cause this (Boulderborn Dragon is one).

When Boulderborn Dragon deals combat damage:

1. Locutus of Borg — makes a token
2. Sharding Sphinx — makes a token
3. Antagonist Incorporator — makes a token
4. Research Thief — draws you 1 card
5. Thopter Spy Network — draws you 1 card
6. Hive Mind Coprocessor — makes you lose life
7. Pia Nalaar, Chief Mechanic — puts a counter on a permanent you control
8. Automated Assembly Line — triggers

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

a nontoken artifact deals combat damage — 1,243 cards in the game can cause this (Boulderborn Dragon is one).

1. Virulent Silencer — When Boulderborn Dragon deals combat damage, Virulent Silencer puts 2 counters on a permanent

an artifact is cast — 3,683 cards in the game can cause this (Boulderborn Dragon is one).

When Boulderborn Dragon is cast:

1. Mendicant Core, Guidelight — copies a spell
2. Sai, Master Thopterist — makes a token
3. Ravenous Robots — makes a token
4. Pinnacle Emissary — makes a token
5. Mirrodin Besieged — makes a token
6. Poetic Ingenuity — makes a token
7. Digsite Engineer — makes a token
8. Myrsmith — makes a token
9. Riddlesmith — draws you 1 card
10. Dr. Madison Li — puts a counter on a permanent you control

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

a nontoken artifact enters the battlefield — 3,768 cards in the game can cause this (Boulderborn Dragon is one).

1. Ultron, Artificial Malevolence — When Boulderborn Dragon enters, Ultron, Artificial Malevolence makes a token

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

a card in a graveyard — 7,589 cards in the game can cause this (Boulderborn Dragon is one).

1. Thor, God of Thunder — Boulderborn Dragon puts cards into the graveyard that Thor, God of Thunder can bring back

443 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 (Boulderborn Dragon is one).

1. Primeval Bounty — When Boulderborn Dragon is cast, Primeval Bounty makes a token

90 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 (Boulderborn Dragon is one).

1. Pollywog Prodigy — When Boulderborn Dragon enters, Pollywog Prodigy puts a counter on itself

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