Woolly Mammoths, I think, would be the poster child of Ice Age for me
Three mana for a huge-bodied flyer that lets you return every spell that targets any one of your creatures (by the way, it's very important to Read The Freaking Card since it took me a few games to realize that it returned spells that targeted ANY of my creatures and not just Feather itself) is a great rate of return, and Krenko, Tin Street Kingpin leaves behind a small army of gobbos when he attacks and can flood the board on his own
Half the time you control the creature like normal, half the time it doesn't exist
When they hit players with lots of permanents, sometimes theyre forced to discard a large portion at the end of their turn
It gets bigger whenever you sacrifice Food and, much like the Marionette Master, it deals a large amount of damage to an opponent when it leaves the battlefield
Ceaseless Conflict We see a lot of wraths these days that follow the blueprint of destroy the board, but leave you with something