Joven

a Rogue creature enters the battlefield — 104 cards in Joven's colors can cause this (Joven is one).

1. Cloak and Dagger — When Joven enters, Cloak and Dagger triggers

an artifact in a graveyard — 557 cards in Joven's colors can cause this (Joven is one).

Joven puts cards into the:

1. Goblin Welder — graveyard that Goblin Welder can bring back
2. Tomakul Scrapsmith — graveyard that Tomakul Scrapsmith can bring back
3. Scrap Mastery — graveyard that Scrap Mastery can bring back
4. Slag Fiend — graveyard, and Slag Fiend gets bigger

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

an artifact is put into a graveyard from the battlefield — 567 cards in Joven's colors can cause this (Joven is one).

When an artifact is put into a graveyard from the battlefield thanks to Joven:

1. Krenko, Baron of Tin Street — makes a token
2. Gremlin Infestation — makes a token
3. Summoning Station — untaps itself
4. Pain Distributor — deals 1 damage
5. Sardian Avenger — deals 1 damage
6. Magnetic Mine — deals 2 damage

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

a Human enters the battlefield — 661 cards in Joven's colors can cause this (Joven is one).

1. Erkenbrand, Lord of Westfold — When Joven enters, Erkenbrand, Lord of Westfold gives +1/+0
2. Vigilante Justice — When Joven enters, Vigilante Justice deals 1 damage

a card in a graveyard — 1,770 cards in Joven's colors can cause this (Joven is one).

1. Heart-Shaped Herb — Joven puts cards into the graveyard that Heart-Shaped Herb can bring back
2. Reito Sentinel — Joven puts cards into the graveyard that Reito Sentinel can bring back
3. Chrome Companion — Joven puts cards into the graveyard that Chrome Companion can bring back
4. Phyrexian Archivist — Joven puts cards into the graveyard that Phyrexian Archivist can bring back
5. Malevolent Chandelier — Joven puts cards into the graveyard that Malevolent Chandelier can bring back
6. Cogwork Archivist — Joven puts cards into the graveyard that Cogwork Archivist can bring back
7. Jade-Cast Sentinel — Joven puts cards into the graveyard that Jade-Cast Sentinel can bring back
8. Hoverstone Pilgrim — Joven puts cards into the graveyard that Hoverstone Pilgrim can bring back
9. Junktroller — Joven puts cards into the graveyard that Junktroller can bring back
10. Relic Golem — Joven fills an opponent's graveyard toward the 8 or more cards Relic Golem needs

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

a creature attacks — 3,451 cards in Joven's colors can cause this (Joven is one).

1. Adaptive Omnitool — When Joven attacks, Adaptive Omnitool searches a library
2. Staff of Titania — When Joven attacks, Staff of Titania makes a token
3. Inquisitorial Rosette — When Joven attacks, Inquisitorial Rosette makes a token
4. Andúril, Flame of the West — When Joven attacks, Andúril, Flame of the West makes 2 tokens
5. Saw — When Joven attacks, Saw sacrifices a creature
6. Ultima Weapon — When Joven attacks, Ultima Weapon kills a creature an opponent controls
7. Total War — When Joven attacks, Total War kills a creature
8. The Spear of Leonidas — When Joven attacks, The Spear of Leonidas triggers
9. Norin the Wary — When Joven attacks, Norin the Wary flickers itself
10. Throwing Knife — When Joven attacks, Throwing Knife sacrifices itself

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

a creature blocks — 3,451 cards in Joven's colors can cause this (Joven is one).

1. Barrow-Blade — When Joven blocks, Barrow-Blade strips abilities
2. Heat of Battle — When Joven blocks, Heat of Battle deals 1 damage
3. Battle Strain — When Joven blocks, Battle Strain deals 1 damage
4. Tide of War — When Joven blocks, Tide of War sacrifices a creature
5. Dead-Iron Sledge — When Joven blocks, Dead-Iron Sledge kills a creature

1 other card cares about it too. These are the ones with the most connections.

anything attacks — 3,451 cards in Joven's colors can cause this (Joven is one).

1. ED-E, Lonesome Eyebot — When Joven attacks, ED-E, Lonesome Eyebot puts a quest counter on itself
2. Misty Mountains Raider — When Joven attacks, Misty Mountains Raider puts 2 counters on a Goblin or Army
3. Razorkin Hordecaller — When Joven attacks, Razorkin Hordecaller makes a token
4. War Effort — When Joven attacks, War Effort makes a token
5. Inti, Seneschal of the Sun — When Joven attacks, Inti, Seneschal of the Sun triggers
6. Gut, True Soul Zealot — When Joven attacks, Gut, True Soul Zealot sacrifices a creature or artifact
7. Cool but Rude — When Joven attacks, Cool but Rude draws and discards
8. Swashbuckler Extraordinaire — When Joven attacks, Swashbuckler Extraordinaire sacrifices a Treasure
9. Puppet Master, String Puller — When Joven attacks, Puppet Master, String Puller triggers
10. Phyrexian Ironworks — When Joven attacks, Phyrexian Ironworks puts a counter on a permanent you control

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

a creature is cast — 3,468 cards in Joven's colors can cause this (Joven is one).

1. Summon: Brynhildr — When Joven is cast, Summon: Brynhildr grants haste
2. Oketra's Monument — When Joven is cast, Oketra's Monument makes a token
3. Screamer-Killer — When Joven is cast, Screamer-Killer deals 5 damage
4. Bontu's Monument — When Joven is cast, Bontu's Monument makes each opponent lose 1 life
5. Vanquisher's Banner — When Joven is cast, Vanquisher's Banner draws you 1 card
6. Hazoret's Monument — When Joven is cast, Hazoret's Monument draws and discards
7. Kefnet's Monument — When Joven is cast, Kefnet's Monument triggers

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

a creature enters the battlefield — 3,801 cards in Joven's colors can cause this (Joven is one).

1. Enduring Courage — When Joven enters, Enduring Courage gives +2/+0
2. Slash, Reptile Rampager — When Joven enters, Slash, Reptile Rampager deals 2 damage
3. Gimli of the Glittering Caves — When Joven enters, Gimli of the Glittering Caves puts counters on a permanent
4. Wingnut, Bat on the Belfry — When Joven enters, Wingnut, Bat on the Belfry grants flying, haste and menace
5. Raphael, Most Attitude — When Joven enters, Raphael, Most Attitude exiles a card from your library

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