Xira Arien

an Insect attacks — 270 cards in Xira Arien's colors can cause this (Xira Arien is one).

1. Fumulus, the Infestation — When Xira Arien attacks, Fumulus, the Infestation makes each opponent lose 1 life

a Wizard creature enters the battlefield — 292 cards in Xira Arien's colors can cause this (Xira Arien is one).

1. Diviner's Wand — When Xira Arien enters, Diviner's Wand triggers

a card is drawn — 1,616 cards in Xira Arien's colors can cause this (Xira Arien is one).

When Xira Arien makes a player draw a card:

1. Ob Nixilis, the Hate-Twisted — deals 1 damage
2. Starving Revenant — makes each opponent lose 1 life
3. Orcish Bowmasters — deals 1 damage
4. Scrawling Crawler — makes each opponent lose 1 life
5. Psychosis Crawler — makes each opponent lose 1 life
6. Fate Unraveler — deals 1 damage
7. Sheoldred, the Apocalypse — gains you 2 life
8. Leela, Sevateem Warrior — puts a +1/+1 counter on itself
9. Razorkin Needlehead — deals 1 damage
10. Burlfist Oak — gets +2/+2

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

anything attacks — 9,997 cards in Xira Arien's colors can cause this (Xira Arien is one).

When Xira Arien attacks:

1. Far Fortune, End Boss — deals 1 damage
2. Grim Javelineer — gives +1/+0
3. ED-E, Lonesome Eyebot — puts a quest counter on itself
4. Fire Navy Trebuchet — makes a token
5. Campsite Cuisine — sacrifices a Food
6. Toph, Earthbending Master — puts a counter on a permanent
7. Inti, Seneschal of the Sun — triggers
8. Gut, True Soul Zealot — sacrifices a creature or artifact
9. Cool but Rude — draws and discards
10. Swashbuckler Extraordinaire — sacrifices a Treasure

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

a creature attacks — 9,997 cards in Xira Arien's colors can cause this (Xira Arien is one).

When Xira Arien attacks:

1. Adaptive Omnitool — searches a library
2. Anthem of Rakdos — gives +2/+0
3. Chorale of the Void — brings a card back
4. Ingris Stingerquill — deals 1 damage
5. Staff of Titania — makes a token
6. Saw — sacrifices a creature
7. Gisa's Favorite Shovel — makes an opponent sacrifice a creature
8. Ultima Weapon — kills a creature an opponent controls
9. Total War — kills a creature
10. The Spear of Leonidas — triggers

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

a creature blocks — 9,997 cards in Xira Arien's colors can cause this (Xira Arien is one).

When Xira Arien blocks:

1. Mage Hunters' Onslaught — makes a player lose 1 life
2. Carnage Gladiator — makes a player lose 1 life
3. Barrow-Blade — strips abilities
4. Heat of Battle — deals 1 damage
5. Battle Strain — deals 1 damage
6. Favor of the Woods — gains you 3 life
7. Gift of the Woods — gives +0/+3
8. Noxious Assault — puts a counter on a permanent
9. Tide of War — sacrifices a creature
10. Dead-Iron Sledge — kills a creature

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

a creature deals combat damage — 9,997 cards in Xira Arien's colors can cause this (Xira Arien is one).

1. Hive Mind Coprocessor — When Xira Arien deals combat damage, Hive Mind Coprocessor makes you lose life

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

a creature is cast — 10,044 cards in Xira Arien's colors can cause this (Xira Arien is one).

When Xira Arien is cast:

1. Primeval Bounty — makes a token
2. Bloodbond March — brings a card back
3. Dancing from Dark to Dawn — puts that spell's mana value counters on a creature
4. Endrek Sahr, Master Breeder — makes that spell's mana value tokens
5. Summon: Fenrir — it arrives with counters thanks to Summon: Fenrir
6. Summon: Brynhildr — grants haste
7. Skittering Horror — sacrifices itself
8. Skittering Skirge — sacrifices itself
9. Skittering Monstrosity — sacrifices itself
10. Silverback Elder — triggers

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

a nontoken creature enters the battlefield — 10,311 cards in Xira Arien's colors can cause this (Xira Arien is one).

When Xira Arien enters:

1. Dual Nature — makes a token
2. Bramble Sovereign — makes a token

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

a creature enters the battlefield — 11,060 cards in Xira Arien's colors can cause this (Xira Arien is one).

When Xira Arien enters:

1. Slash, Reptile Rampager — deals 2 damage
2. Gimli of the Glittering Caves — puts counters on a permanent
3. Legolas Greenleaf — puts a counter on a permanent
4. Wingnut, Bat on the Belfry — grants flying, haste and menace
5. Raphael, Most Attitude — exiles a card from your library

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