Radstorm

you proliferate — 90 cards in the game can cause this (Radstorm is one).

When Radstorm proliferates:

1. Scheming Aspirant — makes each opponent lose 2 life
2. Ezuri, Stalker of Spheres — draws you 1 card
3. Voidwing Hybrid — returns itself from the graveyard
4. Venser, Corpse Puppet — triggers

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

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

When Radstorm is cast:

1. Lunar Mystic — draws you 1 card
2. Ojer Pakpatiq, Deepest Epoch // Temple of Cyclical Time — grants rebound
3. Repeated Reverberation — copies an ability
4. Riku of Two Reflections — copies a spell
5. Sword of Wealth and Power — copies a spell
6. Lilah, Undefeated Slickshot — gets +1/+1
7. Gale, Waterdeep Prodigy — brings a card back
8. Harness the Storm — brings a card back
9. In the Eye of Chaos — counters a spell
10. 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 gets a counter — 4,415 cards in the game can cause this (Radstorm is one).

When a permanent gets a counter thanks to Radstorm:

1. Aether Revolt — deals that much damage
2. Territorial Gorger — gets +2/+2
3. Fabrication Module — puts a counter on a creature
4. All Will Be One — deals that much damage

4 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 (Radstorm is one).

When Radstorm 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
7. Master of Winds — triggers

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