Reason // Believe

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

When Reason // Believe scries:

1. Prudent Fateseer // Peer Review — gives +1/+0
2. Diviner of Victory // Unwind History — gets +1/+1
3. Saheeli, Consul of Oversight — makes a token
4. Celeborn the Wise — makes your creatures bigger
5. Proft, Consulting Detective — puts a +1/+1 counter on itself
6. Matoya, Archon Elder — draws you 1 card
7. Denzilore Fatehold — puts a counter on a creature
8. Elminster — costs less
9. Elrond, Master of Healing — puts a counter on a creature
10. 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 sorcery is cast — 3,720 cards in the game can cause this (Reason is one).

When Reason // Believe is cast:

1. Spellweaver Volute — copies a spell
2. Lilah, Undefeated Slickshot — gets +1/+1
3. Niblis of Frost — gets +1/+1
4. Primeval Bounty — puts 3 counters on a creature
5. Tetsuko Umezawa, Pursuer — gets +1/+1
6. Thor, God of Thunder — deals that spell's mana value damage
7. Krile Baldesion — brings a card back
8. Summon: Good King Mog XII — makes a token
9. Kykar, Wind's Fury — makes a token
10. Blood Funnel — sacrifices a creature

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

a nontoken creature enters the battlefield — 18,448 cards in the game can cause this (Reason is one).

When a creature enters thanks to Reason // Believe:

1. Riku of Two Reflections — makes a token
2. Samwise Gamgee — makes a token
3. Dual Nature — makes a token
4. Chainer, Nightmare Adept — grants haste
5. Preston, the Vanisher — makes a token
6. Angelic Sell-Sword — makes a token
7. Arni, Humble Scribe — untaps itself
8. Saradoc, Master of Buckland — makes a token
9. Lonis, Cryptozoologist — triggers
10. Radiant Solar — triggers

23 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 (Reason is one).

1. Precursor Golem — When Precursor Golem enters thanks to Reason // Believe, it makes 2 tokens
2. Conciliator's Duelist — When Conciliator's Duelist enters thanks to Reason // Believe, it draws you 1 card
3. Master of Winds — When Master of Winds enters thanks to Reason // Believe, it draws you 2 cards
4. Lunarch Veteran // Luminous Phantom — When a creature enters thanks to Reason // Believe, Lunarch Veteran // Luminous Phantom gains you 1 life
5. Pious Evangel // Wayward Disciple — When a creature enters thanks to Reason // Believe, Pious Evangel // Wayward Disciple gains you 1 life
6. Daxos, Blessed by the Sun — When a creature enters thanks to Reason // Believe, Daxos, Blessed by the Sun gains you 1 life
7. Elas il-Kor, Sadistic Pilgrim — When a creature enters thanks to Reason // Believe, Elas il-Kor, Sadistic Pilgrim gains you 1 life
8. Deluge Virtuoso — When Deluge Virtuoso enters thanks to Reason // Believe, it taps a creature an opponent controls
9. Mogg Bombers — When a creature enters thanks to Reason // Believe, Mogg Bombers sacrifices itself
10. Flame-Kin War Scout — When a creature enters thanks to Reason // Believe, Flame-Kin War Scout sacrifices itself

295 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 (Reason is one).

1. Prowl, Stoic Strategist // Prowl, Pursuit Vehicle — When a creature enters thanks to Reason // Believe, Prowl, Stoic Strategist // Prowl, Pursuit Vehicle puts a +1/+1 counter on itself
2. Pigment Wrangler // Striking Palette — When Pigment Wrangler // Striking Palette enters thanks to Reason // Believe, it becomes prepared
3. Sokka, Bold Boomeranger — When Sokka, Bold Boomeranger enters thanks to Reason // Believe, it draws and discards
4. Sanar, Unfinished Genius // Wild Idea — When Sanar, Unfinished Genius // Wild Idea enters thanks to Reason // Believe, it becomes prepared

22 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 (Reason is one).

When Reason // Believe is cast:

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

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