Yeti and Vodyanoi are good for water creatures, once you have water installed (Wall of Ice). I park the Yeti over in fireland, next to BA=AI whenever possble, and put a First Attack/ST+20 spell on him, change the territory to water if it's not too leveled, or use the Waterworld card and then use the Lance or Masamune whenever Ba=AI attacks (Balberit uses the Move command a lot - if he uses the Trapezon item, too, can get the Zombie easily enough with another creature on another turn). Both Yeti and Vod have no land restrictions (unlike Vampire), so they can attack around the board, although Vod is better on defense than offense without a powerful weapon card in hand (higher than the normally-reliable Boomerang).
Yeah, Yeti is awesome when you use him against Gamygin, the Fire Master and give him Wing and later Land Protect! I also use Migoal, Wonder Wall, and Ameoba (with Growth Body/Land Protect) and just Evil Blast his Skeleton spells.