Hostile Desert

a Desert enters the battlefield — 40 cards in the game can cause this (Hostile Desert is one).

1. Hazezon, Shaper of Sand — When Hostile Desert enters, Hazezon, Shaper of Sand makes 2 tokens

a land enters the battlefield — 1,560 cards in the game can cause this (Hostile Desert is one).

When Hostile Desert enters:

1. Primeval Bounty — gains you 3 life
2. Toph, Earthbending Master — puts a counter on a permanent
3. Dancing from Dark to Dawn — makes a token
4. Emeria Shepherd — brings a card back
5. Quest for the Necropolis — puts a quest counter on itself
6. Soul Stair Expedition — puts a quest counter on itself
7. Nissa of Shadowed Boughs — puts counters on a permanent
8. Thranduil, Sindarin Liege // Silvan Rally — makes a token
9. Silvan Reveler — returns itself from the graveyard
10. Floral Evoker — puts a +1/+1 counter on itself

199 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 (Hostile Desert is one).

1. The War Doctor — When Hostile Desert is exiled, The War Doctor puts a time counter on itself

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

When Hostile Desert leaves a graveyard:

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

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