Hall of Storm Giants is the least exciting Cube option by a country mile, but the low opportunity cost does make all five cards worth considering
This thing costs an effective eight mana to transform (less if you control other towns), and you still need to crew it once it becomes airborne, but thats a nice card advantage vehicle hiding on the back half of the land
#2: Venser, Shaper Savant Venser, Shaper Savant is probably my favorite card to play with Naban, Dean of Iteration, since it offers so much flexibility in dealing with both spells and permanents
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Another option is to not declare Medomai as an attacker, which is what the restriction prevents, by using ninjutsu granted to it by Satoru UmezawaSatoru Umezawa