Leonardo, Sewer Samurai

a Ninja enters the battlefield — 32 cards in Leonardo's colors can cause this (Leonardo is one).

1. Quintessential Katana — When Leonardo, Sewer Samurai enters, Quintessential Katana triggers

a creature leaves a graveyard — 213 cards in Leonardo's colors can cause this (Leonardo is one).

When a creature leaves a graveyard thanks to Leonardo, Sewer Samurai:

1. Cyan, Vengeful Samurai — puts a +1/+1 counter on itself
2. Desecrated Tomb — makes a token

anything leaves a graveyard — 506 cards in Leonardo's colors can cause this (Leonardo is one).

When a creature leaves a graveyard thanks to Leonardo, Sewer Samurai:

1. On Wings of Gold — makes a token
2. Owlin Historian — gets +1/+1

a creature attacks — 3,562 cards in Leonardo's colors can cause this (Leonardo is one).

When Leonardo, Sewer Samurai attacks:

1. Adaptive Omnitool — searches a library
2. Staff of Titania — makes a token
3. Glory Bearers — gives +0/+1
4. Ancestor Dragon — gains you life
5. Patron of the Kitsune — gains you 1 life
6. Inquisitorial Rosette — makes a token
7. Saw — sacrifices a creature
8. Ultima Weapon — kills a creature an opponent controls
9. Super-Soldier Serum — triggers
10. Throwing Knife — sacrifices itself

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

anything attacks — 3,562 cards in Leonardo's colors can cause this (Leonardo is one).

When Leonardo, Sewer Samurai attacks:

1. ED-E, Lonesome Eyebot — puts a quest counter on itself
2. Surgical Suite // Hospital Room — puts a counter on a creature
3. Apothecary White — makes a token
4. Adeline, Resplendent Cathar — makes a token
5. Dalkovan Encampment — makes 2 tokens
6. Salvation Colossus — gives +2/+2
7. Lionheart Glimmer — gives +1/+1
8. Urdnan, Dromoka Warrior — grants double strike and first strike
9. Guide of Souls — triggers
10. Warren Warleader — triggers

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

a creature blocks — 3,562 cards in Leonardo's colors can cause this (Leonardo is one).

When Leonardo, Sewer Samurai blocks:

1. Barrow-Blade — strips abilities
2. Noble Stand — gains you 2 life
3. Battle Cry — gives +0/+1
4. Dead-Iron Sledge — kills a creature

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

a nontoken creature attacks — 3,562 cards in Leonardo's colors can cause this (Leonardo is one).

When Leonardo, Sewer Samurai attacks:

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

a creature deals combat damage — 3,562 cards in Leonardo's colors can cause this (Leonardo is one).

1. Antagonist Incorporator — When Leonardo, Sewer Samurai deals combat damage, Antagonist Incorporator makes a token

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

a creature is cast — 3,572 cards in Leonardo's colors can cause this (Leonardo is one).

When a creature is cast thanks to Leonardo, Sewer Samurai:

1. God-Eternal Oketra — makes a token
2. Oketra's Monument — makes a token
3. Quest for the Holy Relic — puts a quest counter on itself
4. Bontu's Monument — makes each opponent lose 1 life
5. Vanquisher's Banner — draws you 1 card
6. Oltec Matterweaver — triggers
7. Pure Reflection — kills a Reflection
8. Bygone Bishop — triggers
9. Flickering Hound — flickers a creature you control
10. Hazoret's Monument — draws and discards

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

a nontoken creature enters the battlefield — 3,697 cards in Leonardo's colors can cause this (Leonardo is one).

When Leonardo, Sewer Samurai enters:

1. Angelic Sell-Sword — makes a token
2. Spirit Bonds — makes a token
3. Metastatic Evangel — proliferates
4. Minion Reflector — makes a token
5. Blessed Sanctuary — makes a token
6. Radiant Solar — triggers
7. Anafenza, Kin-Tree Spirit — puts a counter on a permanent

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

a creature enters the battlefield — 4,091 cards in Leonardo's colors can cause this (Leonardo is one).

When Leonardo, Sewer Samurai enters:

1. Lunarch Veteran // Luminous Phantom — gains you 1 life
2. Daxos, Blessed by the Sun — gains you 1 life
3. Loran, Disciple of History — brings a card back
4. Blasting Station — untaps itself
5. Sanctifier of Souls — gets +1/+1
6. Bloodline Pretender — puts a +1/+1 counter on itself
7. Boss's Chauffeur — puts a +1/+1 counter on itself
8. Mighty Mutanimals — puts a counter on a creature
9. Aetherstorm Roc — puts a counter on a permanent you control
10. Monkey Cage — sacrifices itself

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

anything enters the battlefield — 6,738 cards in Leonardo's colors can cause this (Leonardo is one).

1. Prowl, Stoic Strategist // Prowl, Pursuit Vehicle — When Leonardo, Sewer Samurai enters, Prowl, Stoic Strategist // Prowl, Pursuit Vehicle puts a +1/+1 counter on itself

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