Opt

you scry — 420 cards in the game can cause this (Opt is one).

1. Prudent Fateseer // Peer Review — When Opt scries, Prudent Fateseer // Peer Review gives +1/+0
2. Diviner of Victory // Unwind History — When Opt scries, Diviner of Victory // Unwind History gets +1/+1
3. Saheeli, Consul of Oversight — When Opt scries, Saheeli, Consul of Oversight makes a token
4. Celeborn the Wise — When Opt scries, Celeborn the Wise makes your creatures bigger
5. Proft, Consulting Detective — When Opt scries, Proft, Consulting Detective puts a +1/+1 counter on itself
6. Matoya, Archon Elder — When Opt scries, Matoya, Archon Elder draws you 1 card
7. Denzilore Fatehold — When Opt scries, Denzilore Fatehold puts a counter on a creature
8. Elminster — When Opt scries, Elminster costs less
9. Elrond, Master of Healing — When Opt scries, Elrond, Master of Healing puts a counter on a creature
10. Galadriel of Lothlórien — When Opt scries, Galadriel of Lothlórien puts a land onto the battlefield

10 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 (Opt is one).

When Opt 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.

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

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

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

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

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