1mana monsters

Okay, so I don't like the Skyrian balance because I don't detect any grounds in flavor, and you don't like it because you think it would cost X, where X is the GNP of Skyria, in order to be balanced.  Rather than just whine, I'll suggest some alternatives, with only "magical attunity" and flying/immunity from trapdoors to go on:

Lose this ability. Return target trap to owner's hand. [small statboost]
Lose this ability. Counter.  Failure: Uncounter.  Speed: D
Lose this ability.  Your next spell costs up to 2 less to cast.
Invisible Attack (already suggested, I know, but still seems fine to me) [small statboost]
Vanilla 17/17
Spell Immune and Ability Immune until end of turn. (Speed B ) [small statboost]