Anti-Mage1 change
- Base agility increased by 2
Every change in Dota 2 patch 7.21b, straight from Valve's official notes: 33 heroes, 1 item and 0 neutral items changed. Hero and item names link to their current stats.

Anti-Mage1 change
Bane3 changes
Chaos Knight1 change
Chaos Strike
Crystal Maiden1 change
Freezing Field
Dark Seer2 changes
Grimstroke2 changes
Ink Swell

Soulbind
Io9 changes
Tether

Spirits

Overcharge

Relocate
Talents
Juggernaut1 change
Omnislash
Keeper of the Light1 change
Will-O-Wisp
Leshrac1 change
Lich2 changes
Sinister Gaze
Lifestealer2 changes
Feast
Lina1 change
Lycan1 change
Magnus3 changes
Skewer

Empower
Night Stalker1 change
Omniknight1 change
Phantom Lancer1 change
Phantom Rush
Riki1 change
Shadow Fiend2 changes
Slark1 change
Sniper2 changesTalents
Spectre2 changesTalents
Storm Spirit2 changes
Static Remnant

Electric Vortex
Sven4 changes
Great Cleave

Warcry

God's Strength
Templar Assassin1 change
Meld
Timbersaw2 changes
Whirling Death
Tiny1 change
Tree Grab
Treant Protector1 change
Living Armor
Ursa2 changes
Overpower
Visage2 changes
Summon Familiars
Warlock2 changes
Upheaval
Weaver1 change
Geminate Attack
Source: official Dota 2 patch notes (dota2.com).