Warping Wail
 
If the new colorless mana symbol is considered to represent a sixth color, it's perhaps not surprising that it gets its own "Charm" in the style of Mirage, Visions, Onslaught, Planar Chaos, etc. And what a Charm it is, too. The first mode might have been more relevant in Standard if there were still mana birds around, but there will certainly be times when you can buy some time by AWOL-ing a small creature. (And in larger card pools, don't forget what sort of physically-weak but gameplay-relevant creatures exist - Dark Confidant, Deceiver Exarch, and Spellskite are all valid targets for the first mode.) The rest of the card is, of course, pure advantage. Protecting a Reality Smasher from an imminent Crux of Fate is devastating. Early casting or more castings of powerful colorless creatures is possibly even more devastating. With spells like this on their side, it's no wonder Gideon needed five other planeswalkers to help fight the Eldrazi.
 
Constructed: 4/5
Casual: 4/5
Limited: 4/5
Multiplayer: 4/5
EDH/Commander: 4/5

Warping Wail
 
Modular spells are often some of the most loved in the game. Wail is no different as it's almost never going to be a dead card in hand. it exiles flipwalker jace without batting an eye, stops most boardwipes, draw spells, etc. and at its weakest mode, provides a chump blocker or an extra <> just to hedge your bets. I'm a fan of the card, if only as a hope to see more colorless 

Constructed: 4
Casual: 4
Limited: 4.5
Multiplayer: 3.5
EDH: 3