so is it a chance for the effect to fail or for playing it to fail?
and it comes with a 1 turn doomclock?
It is a chance for the 'playing' it to fail. So, you would play a card as normal and if the 40% chance triggers - the Interference card would do some fancy graphic - maybe like a lightning bolt from the Permanent to your Card being played. Then the card being played is removed from the game. The quanta you spent playing the card is lost.
This card would be EXTREMELY annoying. But I suppose it's OK if it only lasts for 1 turn...
That is the idea.
Sundial's must be pretty annoying for False Gods no? So, why not give entropy a similar card.
If you play this card early, ie. Entropy Tower > Nova > Nova > Interference. You can completely ruin your opponents pillar playing, if he doesn't realise you've played it. Otherwise, you would force him to stall, and not play anything during his first turn - maybe causing him to lose a card? Full hand.
It is mainly to counter Spells. Improved Miracle / Quintessence / Rain of Fire. But it also effects Pillars/Towers, all creatures etc... It will be handy in stopping your opponent from putting down a card combination. Imagine he tries to play a Condor, a Quintessence and a Rain of Fire. Each of those cards being played will have a 40% chance to fail - and if one of them fails, his combination fails.
Any other thoughts?