For example, with Maelstrom Wanderer and a number of other cascade cards looking for free spells in the "Chaos Reigns" deck, I know I'll be adding in Rashmi, Eternities Crafter for more free casting
Lots of cards regularly produce 3/3s you can sacrifice for pure card filtering, and once you get to 4/4s and above, you start raking in the cards
While transformed, it even gains an activated ability that allows it to cause a wolf or werewolf to fight target creature for the cost of four mana, not just adding tokens to the battlefield, but fight-based removal as well
They do, however, collectively beat your opponents senseless if they can't do anything about it
Cait Sith, Fortune Teller Would you pay four to get an Opt to start your combat phases