The evolution of that card over the course of its upgrade is the same as a wizard for a DnD campaign. It starts really, really underwhelming but reaches stratospheric level of power in its late stage. Be it enemy mitigation, sustain, getting clues, this card does everything and testless. It becomes so absurdly powerful that when you get to draw three of them in its fully upgraded form, it will trivialize a scenario on its own. Many ennemies spawn in the first few turns of a scenario when your fighter isn't set up yet? Slam them on the biggest threats, transform them into powerful allies, and distract the other monsters from hurting your friends. This card effectively reads: convert a bomb card from the encounter deck into a boon for yourself. Not only the fact that your allies can also trigger all the effects makes it so versatile, but you effectively remove the biggest threats from being a problem, and thus, instantly.
However the card really needs tonguetwister to get going, but when you get it with thrice spoken things start to escalate. You evade most monster you meet, testlessly get two clues, heal friends, and effectively, definitely remove any monster (except elite) in the game, in a class that has access to ward of protection level two. Congratulation, on your own, you disabled not only the most menacing treacheries, but also the most terrifying monsters the game has to offer. Anything else is just between your main fighter and the boss of the scenario, and your cluever who has all the time of the world to do his job. If you think that as a mystic, you ever needed a weapon, this card solves all problem you need, being slotless and fast. By the way, you don't need weapons when you convert any otherwordly abominations to your cause. This card is worth any xp point you can spend on it.