As long as theyre milling more than 40 permanents (which is rather likely), they should die on the spot
Explosive Mana Generation: Features cards like Skirk Prospector & Goblin Warchiefto generate mana for massive turns, allowing you to cast multiple spells or activate Krenko's ability repeatedly
A three-mana creature with ward 2 is going to at least eat your opponents mana production for a turn if they answer it, or let you do your thing if they dont, and Ghyrsons thing is definitely worth doing
Sadly, a strong candidate for being reprinted in the commander deck, so watch out
Its discover-esque end step trigger provides a substantial source of card advantage, plus the activated ability helps to deal lots of damage
Sapphire Sapphire is eating good this set