Drain the Well

a land in a graveyard — 634 cards in the game can cause this (Drain the Well is one).

Drain the Well puts cards into the:

1. Dread Tiller — graveyard that Dread Tiller can bring back
2. Sparring Dummy — graveyard that Sparring Dummy can bring back
3. Waking the Trolls — graveyard that Waking the Trolls can bring back
4. Soul of Windgrace — graveyard that Soul of Windgrace can bring back
5. Patient Naturalist — graveyard that Patient Naturalist can bring back
6. Blanchwood Prowler — graveyard that Blanchwood Prowler can bring back
7. Fall of the Thran — graveyard that Fall of the Thran can bring back
8. Mind Roots — graveyard that Mind Roots can bring back
9. Centaur Vinecrasher — graveyard, and Centaur Vinecrasher gets bigger
10. Terravore — graveyard, and Terravore gets bigger

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

a land is put into a graveyard from the battlefield — 636 cards in the game can cause this (Drain the Well is one).

When a land is put into a graveyard from the battlefield thanks to Drain the Well:

1. Vastwood Zendikon — brings a card back
2. Nissa's Zendikon — brings a card back
3. Corrupted Zendikon — brings a card back
4. Guardian Zendikon — brings a card back
5. Crusher Zendikon — brings a card back
6. Wind Zendikon — brings a card back
7. Akki Raider — gets +1/+0
8. Dingus Egg — deals 2 damage
9. Genju of the Realm — returns itself from the graveyard

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

life is gained — 2,076 cards in the game can cause this (Drain the Well is one).

When Drain the Well gains life:

1. Dina, Soul Steeper — makes each opponent lose 1 life
2. Marina Vendrell's Grimoire — draws you that many cards
3. South Wind Avatar — makes each opponent lose 1 life
4. Rodolf Duskbringer — grants indestructible
5. Fiendish Panda — puts a +1/+1 counter on itself
6. Veinwitch Coven — brings a card back
7. Cleric Class — puts a counter on a creature
8. Lich's Mastery — draws you that many cards
9. Wall of Limbs — puts a +1/+1 counter on itself
10. Ratchet, Field Medic // Ratchet, Rescue Racer — triggers

84 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 (Drain the Well is one).

When Drain the Well 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. Blood Funnel — sacrifices a creature

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