Nettling

The nettling ability, informally named after the eponymous Nettling Imp card, is an ability that forces opponents' creatures to attack.

Alluring Siren has a unique variant of nettling, that induces target creature an opponent controls attacks you this turn if able; planeswalker Gideon Jura also gets this ability where creatures that player controls attack it if able.

Cards relating to or with the nettling ability
Creatures
 * Avatar of Slaughter (all creatures; also has double strike)
 * Basandra, Battle Seraph
 * Boros Battleshaper
 * Courtly Provocateur
 * Fumiko the Lowblood (creatures your opponents control)
 * Goblin Diplomats</c> (creatures on any given turn)
 * Heckling Fiends</c>
 * Hellraiser Goblin</c> (creatures you control; also have haste)
 * Instigator</c> (creatures target player controls)
 * Maddening Imp</c> (non-Wall creatures the active player controls)
 * Nettling Imp</c>
 * Norritt</c>
 * Oracle en-Vec</c> (any number of chosen creatures target opponent controls)
 * Rage Nimbus</c>
 * Shipwreck Singer</c>
 * Thantis, the Warweaver</c> (all creatures)
 * Viashino Bey</c> (if this attacks, all creatures you control)
 * Walking Desecration</c> (creatures of the creature type of your choice)

Enchantments
 * Bloodshed Fever</c>
 * Curse of the Nightly Hunt</c> (creatures enchanted player controls)
 * Dulcet Sirens</c>
 * <c>Furor of the Bitten</c>
 * <c>Goblin Assault</c> (all Goblin creatures)
 * <c>Guise of Fire</c>
 * <c>Infectious Bloodlust</c>
 * <c>Impending Doom</c>
 * <c>Lust for War</c>
 * <c>Mogis's Warhound</c> (in Aura form)
 * <c>Nettling Curse</c>
 * <c>Skin Invasion</c>
 * <c>Suicidal Charge</c> (creatures your opponents control)
 * <c>Uncontrollable Anger</c>
 * <c>War's Toll</c> (if a creature an opponent controls attacks, all creatures that opponent controls)

Sorceries
 * <c>Taunt</c> (creatures that player controls)

Instants
 * <c>Aggravate</c> (each creature target player controls)
 * <c>Boiling Blood</c>
 * <c>Chemister's Trick</c> (target creature you don't control - Overload)
 * <c>Imps' Taunt</c>
 * <c>Incite</c> (also becomes red)
 * <c>Incite War</c> (bi-modal spell - creatures target player controls)
 * <c>Into the Fray</c>
 * <c>Siren's Call</c> (creatures the active player controls)

Artifacts
 * <c>Arcum's Whistle</c>
 * <c>Bullwhip</c>
 * <c>Tormentor's Trident</c>