This lady is great in Limited since you're probably going to be running at least two colours. Outside of Limited, this card is pretty great too if you're running a multicolour deck. It grows with every nongreen cast (not really, but it's easier than spelling out each cast colour) and things that grow are awesome. It also works well with combat tricks like Colossal Might and Consume Strength. The only issue I have with this is that there's no evasion, but I just think of it as having the text "defending player has one less blocker whenever this creature attacks".
Pros: Grows with red, white, blue, or black spells
Cons: No evasion