If Opposition were printed in white or red... really ANY other color than blue, I wouldn't touch it with a 50 foot pole. It would be all kinds of broken. But I feel like at 2UU, this isn't super easy to abuse.
Oh, it is. I mean, you're certainly right that U is the worst color for it, and it represents a big cost in a Cube without much fixing like yours, but it's still so overwhelmingly strong esp. given said Cube's lowish power level that, well, you know. I'm not sure "U/G Opposition is the best deck" territory (which completely describes the
powered Modo holiday cube, for example) is where I want to be -- decks named for a single card; it's a hell of a card! And the games where it hits the table do have an annoying way of lingering on for a while while the controller is bored and playing with his food and his opponent is as alive as Terri Schiavo. Not much decision to "tap your lands and/or guys" etc.
Glare of Subdual is also quite something, but at least it lets them cast spells ...
Not to degenerate into a bad-beat story but the other day I was playing a powered Cube (some of the old guard put on a satellite to a Vintage Rotisserie Draft -- dinosaurs) and was facing down a morph, I untapped and flashed back lingering souls and played scroll rack and he made an opposition and tapped my bounceland on upkeep. Needless to say, my Wickerbough was stuck in hand (yet another reason bouncelands are bad) which would have been a certainty even had the morph not been
Thelonite Hermit ...
The thing is, with my 2-lander, I was really happy to draw the bounceland t2. As dumb as it sounds, bouncelands are a way for
powered Cubes to increase their decks' consistency. I guess that's the punchline, along with "CML dies, could have not died" and "ugh Opposition"