The buff Don Andres gives to stolen creatures as well as the Treasure tokens he generates when you cast noncreature spells that don't belong to you are nice, but they're far from enough to make stealing cards worthwhile (especially because the treasures enter tapped)
Throw Elas il-Kor, Sadistic Pilgrim into the mix and youve got a lifegain-and-drain engine up and running in no time
The most important keywords in this format are flash, haste, indestructible, and then hexproof followed by some form of evasion
Other mana sources require tapping (for example, Llanowar Elves, or Mox artifacts), others require sacrificing (for example, the "Black Lotus" from the alpha/beta edition), and so on
If this happens, the ability will still resolve and you'll put a +1/+1 counter on Sharp-Eyed Rookie and investigate
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