Ojutai, Soul of Winter Ojutai, Soul of Winter brings a powerful control element to your dragon army
Its second ability protects itself and other resource denial pieces in play, and its first ability easily combines with several other cards to strip opponents hands, and keep them empty
You can save charges across multiple creatures, or use the ability without a creature at all
The only downside I see is that it deals damage based on its power rather than its toughness, but in return, you get to draw many cards based on the latter
Koga allows players to return a Muk or Weezing that is in the active spot to their hand
It has both pivotal lines of text that you need to make a true wall/defender deck work, inverting their damage based on toughness, and allowing defenders to attack