I never realized that this card has a 5 color identity. It can only be played in commander decks that are five colors. All 5 mana symbols appear on the card but the triple blue in the casing cost made me the think this could be played in mono blue. Your islands would not be affected but your opponent would have to think very carefully about how to use their mana. The fact that this card only fits in 5 cor decks definitely limits its playability. Also, the fact that this doesn't have any effect on lands without basic land types. At least, it works on nonbasic lands like the trilands from New capenna. This seems like a stax card meant to disrupt your opponents mana but there are a bunch of problems. First, people do not like stax and people do not like you messing with their lands. This card is probably going to be frowned in edh and it seem too weak for cedh. Next, I do not like playing cards with triple specific mana costs in a 5 color deck. Triple blue is just not viable in a 5 color deck unless you are primarily blue and splashing the other colors. Furthermore, if your opponent is playing mono blue or heavy blue then this card doesn't do much. The cumulative upkeep is also such a tax on your own mana. 3 mana to keep this in play and it only increases from there? I should also note that naked singularity has a very similar effect for the same upkeep cost but has a generic casting cost at 5 mana. If you are playing one you might be playing the other. Reality twist is certainly a strange and fairly unique card but it does not see much play. The top commanders include all the 5 color commanders but most of those decks skip this. One combo would be to make your opponents lands all one land type to attempt to lock them out of the color mana they need to cast. Blood moon and those effects synergies well with this card as do lands like urborg tomb of yawgmoth. Who knows what the future has in store for this card. Any card that can lock you out of mana can be competitive but there are a lot of reasons why this will never see play in our reality.