Mostly it is a combination of his high potential power scaling well into the game combined with a lack of any drawback what so ever that make him so very good
The ability will resolve even if that spell is countered
Sort Card Type Haxorus #88Holo Rare $4.20 Haxorus #89Holo Rare $4.58 Haxorus #16Holo Rare $3.85 Haxorus #69Holo Rare $1.58 Haxorus #111Holo Rare $1.89 Haxorus #156Holo Rare $0.82 Haxorus #112Rare $0.21 Haxorus #46Rare $0.20 Haxorus #70Rare $0.16 Haxorus #46Rare $0.26 Haxorus #36Rare $1.62 Haxorus #47Rare $6.00 Haxorus - 072/086 #72Rare $0.14 Haxorus - 147/086 #147Illustration Rare $75.39 Haxorus - 152/086 #152Art Rare $13.97 Haxorus - 16/20 (Dragon Vault) #16Promo $26.89 Haxorus - 69/101 (Cosmos Holo) #69Promo $5.07 Haxorus - BW57 #BW57Promo $17.98 Haxorus (Master Ball Pattern) #70Rare $13.20 Haxorus (Poke Ball Pattern) #70Rare $0.50 Haxorus - 147/086 #147Illustration Rare $75.39 Haxorus - 16/20 (Dragon Vault) #16Promo $26.89 Haxorus - BW57 #BW57Promo $17.98 Haxorus - 152/086 #152Art Rare $13.97 Haxorus (Master Ball Pattern) #70Rare $13.20 Haxorus #47Rare $6.00 Haxorus - 69/101 (Cosmos Holo) #69Promo $5.07 Haxorus #89Holo Rare $4.58 Haxorus #88Holo Rare $4.20
Additionally, certain Legendary encounters that can only be experienced by some form of communication between games will not be included in any tallies
Erase (Not the Urza's Legacy One) Glasses of Urza Karn, Scion of Urza Liberator, Urza's Battlethopter Sunglasses of Urza Tawnos, Urza's Apprentice Urza Urza Assembles the Titans Urza's Armor Urza's Avenger Urza's Bauble Urza's Blueprints Urza's Cave Urza's Chalice Urza's Command Urza's Contact Lenses Urza's Dark Cannonball Urza's Engine Urza's Factory Urza's Filter Urza's Fun House Urza's Guilt Urza's Hot Tub Urza's Incubator Urza's Mine Urza's Miter Urza's Power Plant Urza's Rage Urza's Rebuff Urza's Ruinous Blast Urza's Saga Urza's Science Fair Project Urza's Sylex Urza's Tome Urza's Tower Urza's Workshop Urza, Academy Headmaster Urza, Chief Artificer Urza, Lord High Artificer Urza, Lord High Artificer Urza, Lord Protector Urza, Planeswalker Urza, Powerstone Prodigy Urza, Prince of Kroog
To make a concrete comparison, I believe Turret Ogre is better than Dreadhorde Twins in most red decks
