Okk

a Goblin attacks — 567 cards in the game can cause this (Okk is one).

1. General Kreat, the Boltbringer — When Okk attacks, General Kreat, the Boltbringer makes a token
2. Mordor Trebuchet — When Okk attacks, Mordor Trebuchet makes a token

a Goblin deals combat damage — 567 cards in the game can cause this (Okk is one).

When Okk deals combat damage:

1. Boggart Mob — makes a token
2. Auntie's Snitch — returns itself from the graveyard
3. Cabal Slaver — triggers
4. Gorbag of Minas Morgul — sacrifices it
5. Moria Marauder — exiles a card from your library

a Goblin enters the battlefield — 622 cards in the game can cause this (Okk is one).

1. Quest for the Goblin Lord — When Okk enters, Quest for the Goblin Lord puts a quest counter on itself
2. Goblin Assassin — When Okk enters, Goblin Assassin makes a player sacrifice a creature

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

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

112 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 (Okk is one).

1. Adaptive Omnitool — When Okk attacks, Adaptive Omnitool searches a library
2. Anthem of Rakdos — When Okk attacks, Anthem of Rakdos gives +2/+0
3. Kindred Discovery — When Okk attacks, Kindred Discovery draws you 1 card
4. Invasion of New Capenna // Holy Frazzle-Cannon — When Okk attacks, Invasion of New Capenna // Holy Frazzle-Cannon puts counters on a permanent
5. Chorale of the Void — When Okk attacks, Chorale of the Void brings a card back
6. Jolene, Plundering Pugilist — When Okk attacks, Jolene, Plundering Pugilist makes a token
7. Saw — When Okk attacks, Saw sacrifices a creature
8. Gisa's Favorite Shovel — When Okk attacks, Gisa's Favorite Shovel makes an opponent sacrifice a creature
9. Ultima Weapon — When Okk attacks, Ultima Weapon kills a creature an opponent controls
10. Total War — When Okk attacks, Total War kills a creature

180 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 (Okk is one).

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

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

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

When Okk 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 (Okk is one).

1. Primeval Bounty — When Okk is cast, Primeval Bounty makes a token
2. Bloodbond March — When Okk is cast, Bloodbond March brings a card back
3. Dancing from Dark to Dawn — When Okk is cast, Dancing from Dark to Dawn puts that spell's mana value counters on a creature
4. Endrek Sahr, Master Breeder — When Okk is cast, Endrek Sahr, Master Breeder makes that spell's mana value tokens
5. Summon: Fenrir — When Okk is cast, it arrives with counters thanks to Summon: Fenrir
6. Summon: Brynhildr — When Okk is cast, Summon: Brynhildr grants haste
7. Skittering Horror — When Okk is cast, Skittering Horror sacrifices itself
8. Skittering Skirge — When Okk is cast, Skittering Skirge sacrifices itself

83 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 (Okk is one).

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

305 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 (Okk is one).

1. Prowl, Stoic Strategist // Prowl, Pursuit Vehicle — When Okk 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.