One important reality check, because it comes up every time: Player-made proxies are not legal for Wizards-sanctioned tournaments
Along with synergising with Up the Beanstalk (more on that later), the Whale provides powerful early removal while late game becoming a finisher thats hard to deal with, thanks to its flash ability enabling you to drop it at the end of your opponents turn, and Ward 2
My prediction: Under Sazh KatzroySazh Katzroy There arent many quality Birds in mono-green, but there arent many quality Bears, either, and look how Ayula, Queen Among BearsAyula, Queen Among Bears turned out
310.11b Sieges have the intrinsic ability When the last defense counter is removed from this permanent, exile it, then you may cast it transformed without paying its mana cost. Example[] Example Invasion of Zendikar Battle Siege 3 (As a Siege enters, choose an opponent to protect it
These unblockable creatures provide you with further avenues for theft via Gonti, Canny Acuisitor , Dream-Thief's Bandanna , or Arcane Heist