Using them for surprise blockers is quite good, but hardly stellar
Tetsuko Umezawa, Fugitive Tetsuko Umezawa, Fugitive works quite well with many infect creatures plus many variants of when this creature deals combat damage, draw a card like Neurok Commando and Scroll Thief
Legendary illustrator Mitsuhiro Arita lent his talents to Lumra, Bellow of the Woods, capturing the sheer scale of the Calamity Beasts
If you make the switch, some of your less valuable cards can play a bigger role, like Armix, Filigree Thrasher and Teshar, Ancestor's Apostle
He'll also let you try to guess what's on top of your library and if you're lucky you might draw another card or two