Undead Rex for me.

I'd say my favorite card is Wavesmith since he is an AMAZING add to the water splinter and it makes me have hope they are going to add more physical damage to the splinter.

That said, since that is an overly popular opinion. I'd like to bring attention to Gargoya Lion. At level 5 this card has Flying and Void +2 armor. This makes him a viable tank against both mage and physical comps. Pairing him with a healer is just absolutely dirty. To top it all off, he is a neutral creature which makes him valuable to ANY player AND he is absurdly cheap at the time of writing this (.083/BCX).