Much like Even the Odds and Timely Reinforcements, control decks get the most use out of the Keeper because you also get to create Soldier tokens as a nice bonus so you dont get overwhelmed by your opponents attacks
Most of the time it means that the sheet (or blades) are in the wrong position when the cards are cut, but I've heard the term used for errors caused by using the wrong type of blades as well (like the Alpha-cut 4th Edition cards, or square cornered cards)
Though this card takes a fair number of turns to have attack-ready, its damage potential and HP make it worth the time and effort
Hopefully, you'll have something much better to do on your turn, but if you're in a desperate spot, you might be able to use the chump blocker and the bonus card it provides to find a way out
Cloud Of Faeries The best classic faerie card (he's from way back in the "Summon Creature" days), this guy is essentially a free 1/1 flier that you can also cycle out for 2 mana if you don't need the extra creature