Causes: create a Rabbit creature token, put a Rabbit creature token onto the battlefield, exile an artifact, exile a battle, exile a creature, exile an enchantment, exile a planeswalker, an artifact leaves the battlefield, a battle leaves the battlefield, a creature leaves the battlefield, an enchantment leaves the battlefield, a planeswalker leaves the battlefield, draw a card, put a permanent onto the battlefield, a permanent leaves a graveyard, put a counter on anything.

Cares about: a permanent in a graveyard.

Works well with

a Rabbit enters the battlefield — 95 cards in the game can cause this (Season of the Burrow is one).

When a Rabbit enters thanks to Season of the Burrow:

Harvestrite Host — gives +1/+0
Valley Questcaller — scries

1 other card cares about it too. These are the ones with the most connections.

a permanent enters the battlefield — 152 cards in the game can cause this (Season of the Burrow is one).

Dawn-Blessed Pennant — When a Rabbit enters thanks to Season of the Burrow, Dawn-Blessed Pennant gains you 1 life
River Kelpie — When a permanent enters thanks to Season of the Burrow, River Kelpie draws you 1 card
Altar of the Brood — When a Rabbit enters thanks to Season of the Burrow, Altar of the Brood mills a card
Amareth, the Lustrous — When a Rabbit enters thanks to Season of the Burrow, Amareth, the Lustrous searches a library
Rimefire Torque — When a Rabbit enters thanks to Season of the Burrow, Rimefire Torque puts a charge counter on itself
Eye of Singularity — When a Rabbit enters thanks to Season of the Burrow, Eye of Singularity kills a permanent

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

put a permanent into a graveyard — 173 cards in the game can cause this.

Stitcher's Graft — Stitcher's Graft puts cards into the graveyard that Season of the Burrow can bring back
Worldslayer — Worldslayer puts cards into the graveyard that Season of the Burrow can bring back
Extricator of Sin // Extricator of Flesh — Extricator of Sin // Extricator of Flesh puts cards into the graveyard that Season of the Burrow can bring back
Lich's Tomb — Lich's Tomb puts cards into the graveyard that Season of the Burrow can bring back
Behemoth of Vault 0 — Behemoth of Vault 0 puts cards into the graveyard that Season of the Burrow can bring back
End Hostilities — End Hostilities puts cards into the graveyard that Season of the Burrow can bring back
Ugin's Construct — Ugin's Construct puts cards into the graveyard that Season of the Burrow can bring back
Wirefly Hive — Wirefly Hive puts cards into the graveyard that Season of the Burrow can bring back
World Queller — World Queller puts cards into the graveyard that Season of the Burrow can bring back
Giant's Boulder — When Giant's Boulder is in the graveyard, Season of the Burrow can bring it back

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

an artifact is exiled — 336 cards in the game can cause this (Season of the Burrow is one).

Shard of the Void Dragon — When an artifact is exiled thanks to Season of the Burrow, Shard of the Void Dragon puts 2 +1/+1 counters on itself

1 other card cares about it too. These are the ones with the most connections.

a creature is exiled — 1,003 cards in the game can cause this (Season of the Burrow is one).

When a creature is exiled thanks to Season of the Burrow:

Ashnod's Intervention — brings a card back
Soulherder — puts a +1/+1 counter on itself

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

anything is exiled — 2,497 cards in the game can cause this (Season of the Burrow is one).

The War Doctor — When a creature, artifact, enchantment, planeswalker or battle is exiled thanks to Season of the Burrow, The War Doctor puts a time counter on itself

anything leaves a graveyard — 2,503 cards in the game can cause this (Season of the Burrow is one).

When a permanent leaves a graveyard thanks to Season of the Burrow:

Blastoneuron — makes each opponent lose 1 life
Defiled Crypt // Cadaver Lab — makes a token
Teval, the Balanced Scale — makes a token
Hologram Stalker — makes a token
Tormod, the Desecrator — makes a token
Quintorius, Field Historian — makes a token
Garrison Excavator — makes a token
Amzu, Swarm's Hunger — makes a token
Kirol, History Buff // Pack a Punch — becomes prepared
Teval's Judgment — triggers

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

a creature token enters the battlefield — 2,799 cards in the game can cause this (Season of the Burrow is one).

When a Rabbit enters thanks to Season of the Burrow:

Securitron Squadron — puts a counter on a permanent
Anointer Priest — gains you 1 life
Nesting Dovehawk — puts a +1/+1 counter on itself

a creature token is created — 2,799 cards in the game can cause this (Season of the Burrow is one).

Staff of the Storyteller — When Season of the Burrow makes a Rabbit token, Staff of the Storyteller puts a story counter on itself

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

a token enters the battlefield — 3,710 cards in the game can cause this (Season of the Burrow is one).

When a Rabbit enters thanks to Season of the Burrow:

Baron Bertram Graywater — makes a token
Marneus Calgar — draws you 1 card
Belladonna Took — gains you 1 life
Kambal, Profiteering Mayor — makes each opponent lose 1 life
Lucy MacLean, Positively Armed — makes a token
Mister Fantastic, Reed Richards — draws you 1 card
Cloakwood Swarmkeeper — puts a +1/+1 counter on itself
Woodland Champion — puts that many +1/+1 counters on itself
Leonardo, the Balance — puts a counter on a creature
Spiritcall Enthusiast // Scrollboost — becomes prepared

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

a token is created — 3,711 cards in the game can cause this (Season of the Burrow is one).

When Season of the Burrow makes a Rabbit token:

Akim, the Soaring Wind — makes a token
Idol of Oblivion — draws you 1 card
Rosie Cotton of South Lane — puts a counter on a permanent
Mirkwood Bats — makes each opponent lose 1 life

17 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 (Season of the Burrow is one).

When Season of the Burrow is cast:

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

424 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 (Season of the Burrow is one).

When a permanent makes a player draw a card thanks to Season of the Burrow:

Ob Nixilis, the Hate-Twisted — deals 1 damage
Orcish Bowmasters — deals 1 damage
Scrawling Crawler — makes each opponent lose 1 life
Xyris, the Writhing Storm — makes a token
Fate Unraveler — deals 1 damage
Sheoldred, the Apocalypse — makes a player lose 2 life
Nekusar, the Mindrazer — deals 1 damage
Leela, Sevateem Warrior — puts a +1/+1 counter on itself

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

a nontoken creature leaves the battlefield — 4,133 cards in the game can cause this (Season of the Burrow is one).

Dual Nature — When a creature leaves the battlefield thanks to Season of the Burrow, Dual Nature exiles a creature

3 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 (Season of the Burrow is one).

Deluge Virtuoso — When Deluge Virtuoso enters thanks to Season of the Burrow, it taps a creature an opponent controls

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