Thranduil, the Elvenking

an Elf attacks — 723 cards in the game can cause this (Thranduil is one).

When Thranduil, the Elvenking attacks:

1. Celeborn the Wise — scries
2. Tyvar the Bellicose — grants deathtouch
3. Harald Unites the Elves — shrinks a creature by -1/-1
4. Arboreal Alliance — triggers

a nontoken Elf enters the battlefield — 728 cards in the game can cause this (Thranduil is one).

1. Wirewood Hivemaster — When Thranduil, the Elvenking enters, Wirewood Hivemaster makes a token

an Elf it boosts — 739 cards in the game can cause this.

1. Pride of the Perfect — Pride of the Perfect gives Thranduil, the Elvenking bigger stats

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

an Elf enters the battlefield — 752 cards in the game can cause this.

1. Wolverine Riders — When Thranduil, the Elvenking enters, Wolverine Riders gains you its toughness life
2. Elvish Warmaster — When Thranduil, the Elvenking enters, Elvish Warmaster makes a token
3. Elvish Vanguard — When Thranduil, the Elvenking enters, Elvish Vanguard puts a +1/+1 counter on itself
4. Marwyn, the Nurturer — When Thranduil, the Elvenking enters, Marwyn, the Nurturer puts a +1/+1 counter on itself
5. Woodland Weavemaster — When Thranduil, the Elvenking enters, Woodland Weavemaster gets +1/+1
6. Ayara, First of Locthwain — When Ayara, First of Locthwain enters, Thranduil, the Elvenking draws you 2 cards
7. Lonis, Genetics Expert — When Lonis, Genetics Expert enters, Thranduil, the Elvenking draws you 2 cards
8. Ezuri, Claw of Progress — When Ezuri, Claw of Progress enters, Thranduil, the Elvenking draws you 2 cards
9. Selvala, Heart of the Wilds — When Selvala, Heart of the Wilds enters, Thranduil, the Elvenking draws you 2 cards
10. Elrond, Lord of Rivendell — When Elrond, Lord of Rivendell enters, Thranduil, the Elvenking draws you 2 cards
11. Lonis, Cryptozoologist — When Lonis, Cryptozoologist enters, Thranduil, the Elvenking draws you 2 cards
12. Varis, Silverymoon Ranger — When Varis, Silverymoon Ranger enters, Thranduil, the Elvenking draws you 2 cards
13. Krydle of Baldur's Gate — When Krydle of Baldur's Gate enters, Thranduil, the Elvenking draws you 2 cards
14. Gwenna, Eyes of Gaea — When Gwenna, Eyes of Gaea enters, Thranduil, the Elvenking draws you 2 cards
15. Momir Vig, Simic Visionary — When Momir Vig, Simic Visionary enters, Thranduil, the Elvenking draws you 2 cards
16. High Perfect Morcant — When Thranduil, the Elvenking enters, High Perfect Morcant puts a counter on a permanent an opponent controls
17. Maralen, Fae Ascendant — When Thranduil, the Elvenking enters, Maralen, Fae Ascendant exiles a card from an opponent's library

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

a card is discarded — 2,042 cards in the game can cause this (Thranduil is one).

When Thranduil, the Elvenking makes a player discard a card:

1. Ivora, Insatiable Heir — puts a +1/+1 counter on itself
2. Cool but Rude — deals 2 damage
3. Containment Construct — brings a card back
4. Moonstone, Harsh Mistress — brings a card back
5. Lazotep Chancellor — puts 2 counters on a Zombie or Army
6. Magmakin Artillerist — deals that much damage
7. Inti, Seneschal of the Sun — exiles a card from your library
8. Pitchstone Wall — sacrifices itself
9. Currency Converter — exiles it
10. Hostile Investigator — triggers

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

a card is drawn — 3,815 cards in the game can cause this (Thranduil is one).

When Thranduil, the Elvenking makes a player draw a card:

1. Temmet, Naktamun's Will — gives +1/+1
2. Niv-Mizzet, Parun — deals 1 damage
3. Aether Syphon — mills a card
4. The Locust God — makes a token
5. Starving Revenant — makes each opponent lose 1 life
6. Diviner's Wand — gets +1/+1
7. Ominous Seas — puts a foreshadow counter on itself
8. Dream Trawler — gets +1/+0
9. Iron Man, Armored Avenger — puts a counter on a creature
10. The Astonishing Ant-Man — puts a +1/+1 counter on itself

57 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 (Thranduil is one).

Thranduil, the Elvenking:

1. Samwise Gamgee — puts cards into the graveyard that Samwise Gamgee can bring back
2. Bloodbond March — puts cards into the graveyard that Bloodbond March can bring back
3. Thor, God of Thunder — puts cards into the graveyard that Thor, God of Thunder can bring back
4. Gale, Waterdeep Prodigy — puts cards into the graveyard that Gale, Waterdeep Prodigy can bring back
5. Harness the Storm — puts cards into the graveyard that Harness the Storm can bring back
6. Transplant Theorist — puts cards into the graveyard that Transplant Theorist can bring back
7. Heart-Shaped Herb — puts cards into the graveyard that Heart-Shaped Herb can bring back
8. Wayward Angel — fills your graveyard toward the 7 or more cards Wayward Angel needs
9. Rescue from the Underworld — puts cards into the graveyard that Rescue from the Underworld can bring back
10. Victimize — puts cards into the graveyard that Victimize can bring back

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

anything goes to a graveyard — 7,589 cards in the game can cause this (Thranduil is one).

When a card hits the graveyard thanks to Thranduil, the Elvenking:

1. Quest for Ancient Secrets — puts a quest counter on itself
2. Planar Void — hits a graveyard
3. Measure of Wickedness — gives an opponent control of itself
4. Energy Field — sacrifices itself

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

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

When Thranduil, the Elvenking attacks:

1. Far Fortune, End Boss — deals 1 damage
2. Invisible Woman — triggers
3. Caesar, Legion's Emperor — sacrifices a creature
4. Guide of Souls — triggers

129 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 (Thranduil is one).

When Thranduil, the Elvenking attacks:

1. Adaptive Omnitool — searches a library
2. Saw — sacrifices a creature

198 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 (Thranduil is one).

When Thranduil, the Elvenking enters:

1. Slash, Reptile Rampager — deals 2 damage
2. Gimli of the Glittering Caves — puts counters on a permanent
3. Ray Fillet, Wave Warrior — puts a counter on itself
4. Legolas Greenleaf — puts a counter on a permanent
5. The Neutrinos — gets +1/+0
6. Aetherstorm Roc — puts a counter on a permanent you control
7. Raphael, Most Attitude — exiles a card from your library

348 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 (Thranduil is one).

1. Prowl, Stoic Strategist // Prowl, Pursuit Vehicle — When Thranduil, the Elvenking enters, Prowl, Stoic Strategist // Prowl, Pursuit Vehicle puts a +1/+1 counter on itself

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