Unstable Portal - Tell us your woes.

So unstable portal is ridculously broken, right? It will 95% of the time grant you a card of equal value or greater, with a massive mana cost reduction. Sure, it's random and for that reason it may not be competitively viable, but in casual play it's just stupid.

Yes, I just played against a mage who cast Unstable Portal and got Ysera which they played on turn 6 or 7. Hurts.