Yeah, "cast from hand" covers a lot of their bases. Plus, I don't think Rebound can mechanically be printed on anything other than Instants or Flash spells.
If it's a sorcery, you wouldn't be able to rebound it during your next upkeep because you can only cast a sorcery during your main phase...
At first blink, I thought Totem Armor was going to be an in-set answer to Annihilator. Obviously wrong about it, but on top of that, it could make an on-the-table Eldrazi (or any other fatty) a bitch to get rid of.
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