the only time a non-burrowing creature can do it is when they hatch from a graboid (which always seem to end up with hatch, immaterial, or freeze)
i'm not really sure why there is no sniper, there is destroy and steal, i think sniper would work well.
the reason the queens are 3/7 is because they are hatched, which chooses a random creature (ffq in this case).
i really hate the glitches with momentum (mutated will still only have momentum, PU'd will lose its real ability)
i'm not sure what happens when you mutate a charger, never had the two in the same deck.