Tunnel

an instant is cast — 3,931 cards in the game can cause this (Tunnel is one).

1. Electro, Assaulting Battery — When Tunnel is cast, Electro, Assaulting Battery adds 1 mana
2. Lunar Mystic — When Tunnel is cast, Lunar Mystic draws you 1 card
3. Ojer Pakpatiq, Deepest Epoch // Temple of Cyclical Time — When Tunnel is cast, Ojer Pakpatiq, Deepest Epoch // Temple of Cyclical Time grants rebound
4. Repeated Reverberation — When Tunnel is cast, Repeated Reverberation copies an ability
5. Riku of Two Reflections — When Tunnel is cast, Riku of Two Reflections copies a spell
6. Sword of Wealth and Power — When Tunnel is cast, Sword of Wealth and Power copies a spell
7. Lilah, Undefeated Slickshot — When Tunnel is cast, Lilah, Undefeated Slickshot gets +1/+1
8. Gale, Waterdeep Prodigy — When Tunnel is cast, Gale, Waterdeep Prodigy brings a card back
9. In the Eye of Chaos — When Tunnel is cast, In the Eye of Chaos counters a spell
10. Niblis of Frost — When Tunnel is cast, Niblis of Frost taps a creature an opponent controls

427 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 (Tunnel is one).

1. Heart-Shaped Herb — Tunnel puts cards into the graveyard that Heart-Shaped Herb can bring back
2. Enlightened Confidant — Tunnel puts cards into the graveyard that Enlightened Confidant can bring back
3. Tergrid, God of Fright // Tergrid's Lantern — Tunnel puts cards into the graveyard that Tergrid, God of Fright // Tergrid's Lantern can bring back
4. Grazing Kelpie — Tunnel puts cards into the graveyard that Grazing Kelpie can bring back
5. Dauthi Voidwalker — Cards Tunnel would put into an opponent's graveyard are exiled by Dauthi Voidwalker instead, and it can play from among them
6. Endurance — Tunnel puts cards into the graveyard that Endurance can bring back
7. Thieves' Guild Enforcer — Tunnel fills an opponent's graveyard toward the 8 or more cards Thieves' Guild Enforcer needs
8. Soaring Thought-Thief — Tunnel fills an opponent's graveyard toward the 8 or more cards Soaring Thought-Thief needs
9. Athreos, Shroud-Veiled — Tunnel puts cards into the graveyard that Athreos, Shroud-Veiled can bring back
10. Merfolk Windrobber — Tunnel fills an opponent's graveyard toward the 8 or more cards Merfolk Windrobber needs

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 (Tunnel is one).

When a Wall hits the graveyard thanks to Tunnel:

1. The Haunt of Hightower — puts a +1/+1 counter on itself
2. Duskmantle Guildmage — makes each opponent lose 1 life
3. Vulturous Zombie — puts a +1/+1 counter on itself
4. Bloodchief Ascension — makes each opponent lose 2 life
5. Planar Void — hits a graveyard

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

anything is cast — 31,128 cards in the game can cause this (Tunnel is one).

1. Windrider Wizard — When Tunnel is cast, Windrider Wizard draws you 1 card
2. Relic Amulet — When Tunnel is cast, Relic Amulet puts a charge counter on itself
3. Rockslide Sorcerer — When Tunnel is cast, Rockslide Sorcerer deals 1 damage
4. Umara Wizard // Umara Skyfalls — When Tunnel is cast, Umara Wizard // Umara Skyfalls grants flying
5. Alania, Divergent Storm — When Tunnel is cast, Alania, Divergent Storm makes an opponent draw 1 card
6. Umara Mystic — When Tunnel is cast, Umara Mystic gets +2/+0
7. Master of Winds — When Tunnel is cast, Master of Winds triggers

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