Hostage Taker only has three toughness, so chances are it'll be taken out of play before you can complete your grand theft
Basically, it can attack right away, doesnt tap when it does, can only be blocked by two or more creatures, and if it does get blocked, excess damage hits the enemy player
The Ravens Warning is also getting played in UW Limited builds, along with Vega, the Watcher, and Kangee, Sky Warden EDH decks
By transforming it
1 Tiana - Restaurant Owner 206/204, Amber Tiana finally has her own restaurant on Tiana - Restaurant Owner, and the Enchanted version depicts her dancing through the tables with a host of waiters and musicians behind her
This happens only at sorcery speed and costs 3 mana, still this abilty can get out of control quickly