Notes

Ogre Magi (Hero in Dota that is a blue 2 headed ogre)
(Mal)Furion (Nature's Prophet's DotA 1 name)
(Ancient) Brewmaster (Dota hero that is a "Pandaren" that goes by same name. In fact, the Ancient Brewmaster card says "Most pandaren say his brew tastes like yak. But apparently that's a compliment")
Wisp (Io the Guardian Wisp in Dota used to be called Wisp, and looks familiar)
Anub'arak (Nyx Assassin from Dota 2 was originally Anub'arak the Nerubian Assassin in DotA 1. He's been renamed to simply, Nyx Assassin.)
Obsidian Destroyer (Outworld Devourer's original DotA 1 name. He was first called Obsidian Destroyer, which was changed to Obsidian Demolisher, to Outworld Demolisher, to Outworld Destroyer, to finally Outworld Devourer)
Siphon Soul (This is a spell by the same name used by Death Prophet in Dota 2)
Illidan Stormrage (Famous Dota 2 competitive "professional" player that played on a big Russian team, Virtus.Pro)
Sylvanas Windrunner (Sylvanas was DotA 1's Windrunner's name. She's since been renamed to Lyralei the Windranger)
Void Crusher (The picture reminds me much of Enigma from Dota 2, who has a spell Black Hole that is like a Void Crusher lol)
Bloodlust (Ogre Magi who I talked about being a two headed ogre has a skill called bloodlust)
Slithering Guard (Slardar from Dota 2 is called Slardar the Slithereen Guard, and looks similar besides be blue/purple to the picture on the card)
Tuskarr Jouster (Tuskarr is a hero in DotA 1 that was renamed to Ymir, the Tusk)
Vol'jin (Dota 2's Witch Doctor's name in DotA 1 was Vol'jin the Witch Doctor. It has been changed to Zharvakko the Witch Doctor)
Magnataur Alpha (Magnus in Dota 2 is officially called "Magnus the Magnotaur," and his lore describes him being the "Alpha Male" of his Magnotaur tribe)
Piloted Shredder (Dota 2's Timbersaw was originally, in DotA 1, named "Rizzrak the Goblin Shredder." On the card, it says "Once upon a time, only goblins piloted shredders..." He was renamed to Rizzrack the Timbersaw in Dota 2)
Pit Lord (Pit Lord is a hero from DotA 1 that has not yet been put into Dota 2. He is the only one of 112 heroes that hasn't been ported over yet. His DotA 1 model looks similar to the card)
Bash (Bash is a type of stun in DotA 1 and 2. It is considered a bash if you can stun the enemy with your normal attack.)
Frost Nova (This is a spell currently used by Dota 2's Crystal Maiden. In DotA 1, however, it was used by Lich and Crystal Maiden)
Hex (Hex is another type of stun in DotA 1 and 2. It turns your hero into a harmless 1. Frog, 2. Pig, 3. Chicken, 4. Fish depending on who's using Hex.)
Nerubian (Aforementioned Nyx Assassin was called Nerubian Assassin. He was called this because he was the Assassin of the "Nerubian" race. His lore has changed so he is a scarab (sort of like a Nerubian) that is Nyx's (the Goddess of the Night) personal Assassin.)
Shadowfiend (Shadow Fiend is a hero from DotA 1 and 2. Same name, not much else)
Faerie Dragon (Puck from Dota 2 is officially called "Puck, the Faerie Dragon," with a similar color scheme)
Kobold Geomancer (Kobolds are a Neutral creep in DotA 1 and 2, and one is called the Kobold Geomancer, but doesn't look like the one on the card)
Mistress of Pain (Similar in color scheme and overall design of DotA 1 and 2's Queen of Pain)
Murloc Tidehunter (Tidehunter is a hero in DotA 1 and 2. One of his voice lines from Dota 2 is "Death will rise, from the tides!" just like the card says on it)
Succubus (Aforementioned Queen of Pain from DotA 1 and 2 is a Succubus)
Rooted (Rooting is a type of disable in Dota where you can turn, attack, cast spells, use items, but can't move)
Silence (Silence in Dota keeps you from casting spells, and sometimes, using items)
Thrall (Thrall is the name of DotA 1 and 2's Disruptor)

Yeah, and these are just a few I saw skimming over...