If you combine them with Toxrill, the Corrosives ability to weaken your opponents creatures all at once you can gain a lot of life and do a lot of damage when you wipe out your enemies boards
All his abilities are strong, both in a vacuum and in the context of your average rainbow, goodstuff pile
Gwenom, Remorseless Gwenom, Remorseless offers you a very nice bonus when it attacks, and even if your opponent blocks and kills your creature, youll get some life and trade with the defender
Youre replaying fetch lands, hitting every land drop, and quietly pulling ahead on resources
You may cast it without paying its mana cost
Whether these two counterspells are something you could feasibly get a hold of or not, you've got to admit they're pretty cool, even if one overshadows the other by a colossal amount