Like most Magic: The Gathering cards, the value of Immerwolf depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Dark Ascension)
Infect doesn't defend creatures with too much countermagic anyway) Green Melira, Sylvok Outcast Nature's Claim Vines of Vastwood Fog Seal of Primordium Honorable mention: Choke It's a trap!: Beast Within (three mana for removal is way too expensive, especially if it's vulnerable to Skite/Blessing/Vines) Multicolored Deflecting Palm Zealous Persecution Fulminator Mage Izzet Staticaster Crackling Doom Honorable mention: Golgari Charm It's a trap!: Abrupt Decay (Too expensive, stopped by Skite/Vines/Blessing, can't even hit Inkmoth) Colorless Spellskite Chalice of the Void Engineered Explosives Ensnaring Bridge Pithing Needle Honorable mention: Platinum Angel It's a trap!: Relic of Progenitus (Shouldn't have to say this, but I see it all the time
Every last scarab of the Sautekh Dynasty is his to control, and he wields his power with ruthless efficiency
You can use its impending cost and cast it as an enchantment for to get the tokens in advance, and if you can flicker it, you get even more value