Dragoon Spear is a solid card to introduce this mechanic
If you pay the mutate cost, you then target a non-human creature thats already in play (that you own) to be mutated
In an aristocrats deck, this is brutally strong, too, as Blight Mound lets you double the number of creatures you sacrifice
Heres the thing: Magic is this huge game of many, many possibilities
While it is a very corner case, if you are looking to resolve a spell on your turn and your opponent has a Wasteland up, crack your fetchland first , or else they could Wasteland your fetchland and if you then crack it in response, they could respond with a Daze on your spell
Very playable and will grind out most games for you if he lives long enough, the feel of having him about in a relatively even game is that of drawing an extra card every turn, you just wind up ahead after a while