Songbird, Sonic Screamer

a Villain enters the battlefield — 99 cards in Songbird's colors can cause this (Songbird is one).

When Songbird, Sonic Screamer enters:

1. Doom Reigns Supreme — makes each opponent lose 1 life
2. Crossbones, Malicious Mercenary — puts a +1/+1 counter on itself
3. Yellowjacket, Heartless Marauder — gets +1/+0
4. Swordsman, Sharp Scoundrel — triggers
5. Baron Strucker, HYDRA Overlord — draws and discards

a card is discarded — 641 cards in Songbird's colors can cause this (Songbird is one).

When Songbird, Sonic Screamer makes a player discard a card:

1. Containment Construct — brings a card back
2. Moonstone, Harsh Mistress — brings a card back
3. Archfiend of Ifnir — puts a counter on a creature
4. Tinybones, Pocket Nuisance — deals 1 damage
5. Horror of the Broken Lands — gets +2/+1
6. Cryptcaller Chariot — makes that many tokens
7. Dying to Serve — makes a token
8. Currency Converter — exiles it
9. Hostile Investigator — triggers
10. Bag of Holding — exiles it

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

life is gained — 642 cards in Songbird's colors can cause this (Songbird is one).

When Songbird, Sonic Screamer gains life:

1. South Wind Avatar — makes each opponent lose 1 life
2. Veinwitch Coven — brings a card back
3. Lich's Mastery — draws you that many cards
4. Wall of Limbs — puts a +1/+1 counter on itself
5. MACH-1, Swooping Scoundrel — surveils
6. Enduring Tenacity — makes each opponent lose life equal to that much
7. Nazar, the Velvet Fang — puts a feeding counter on itself
8. Citizen V, Helmut Zemo — puts a counter on a Villain
9. Bloodbond Vampire — puts a +1/+1 counter on itself
10. Leech Collector // Bloodletting — becomes prepared

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

a card in a graveyard — 2,555 cards in Songbird's colors can cause this (Songbird is one).

Songbird, Sonic Screamer:

1. Heart-Shaped Herb — puts cards into the graveyard that Heart-Shaped Herb can bring back
2. Rescue from the Underworld — puts cards into the graveyard that Rescue from the Underworld can bring back
3. Victimize — puts cards into the graveyard that Victimize can bring back
4. Tergrid, God of Fright // Tergrid's Lantern — puts cards into the graveyard that Tergrid, God of Fright // Tergrid's Lantern can bring back
5. Sivriss, Nightmare Speaker — puts cards into the graveyard that Sivriss, Nightmare Speaker can bring back
6. Repentant Vampire — fills your graveyard toward the 7 or more cards Repentant Vampire needs
7. Treacherous Vampire — fills your graveyard toward the 7 or more cards Treacherous Vampire needs
8. Xiahou Dun, the One-Eyed — puts cards into the graveyard that Xiahou Dun, the One-Eyed can bring back
9. Gloomdrifter — fills your graveyard toward the 7 or more cards Gloomdrifter needs
10. Loot, the Anomaly — fills your graveyard toward the 7 or more cards Loot, the Anomaly needs

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

anything goes to a graveyard — 2,555 cards in Songbird's colors can cause this (Songbird is one).

When a card hits the graveyard thanks to Songbird, Sonic Screamer:

1. Planar Void — hits a graveyard
2. Measure of Wickedness — gives an opponent control of itself

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

a creature attacks — 3,478 cards in Songbird's colors can cause this (Songbird is one).

When Songbird, Sonic Screamer attacks:

1. Adaptive Omnitool — searches a library
2. Chorale of the Void — brings a card back
3. Staff of Titania — makes a token
4. Inquisitorial Rosette — makes a token
5. Wand of Orcus — grants deathtouch
6. Andúril, Flame of the West — makes 2 tokens
7. Saw — sacrifices a creature
8. Gisa's Favorite Shovel — makes an opponent sacrifice a creature
9. Ultima Weapon — kills a creature an opponent controls
10. Throwing Knife — sacrifices itself

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

anything attacks — 3,478 cards in Songbird's colors can cause this (Songbird is one).

When Songbird, Sonic Screamer attacks:

1. Grim Javelineer — gives +1/+0
2. ED-E, Lonesome Eyebot — puts a quest counter on itself
3. Fire Navy Trebuchet — makes a token
4. Stensian Sanguinist // Exsanguinate — grants deathtouch
5. Rev, Tithe Extractor — grants deathtouch
6. Boggart Prankster — gives +1/+0
7. Within Range — makes each opponent lose life
8. Curse of Disturbance — makes a token
9. Dawnsire, Sunstar Dreadnought — deals 100 damage
10. Twins of Discord — triggers

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

a creature blocks — 3,478 cards in Songbird's colors can cause this (Songbird is one).

When Songbird, Sonic Screamer blocks:

1. Mage Hunters' Onslaught — makes a player lose 1 life
2. Barrow-Blade — strips abilities
3. Dead-Iron Sledge — kills a creature

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