Harmless Offering: Great artwork
Instead of introducing a balancing mechanic, AWOL creates a third tier of removal, the absolutely-removed-from-the-freaking-game-forever zone. Let's be honest, though
It can be very brutal in combination with an Overrun effect, perhaps they left a Wildspeaker in play with 4 loyalty because they were able to kill all your creatures
Take this unique shell from ChelliD, who went 4-1 in a Standard Champs Qualifier with four copies of Golgari Guildgate: Creatures (4) Planeswalkers (14) Lands (25) Spells (17) 2 Thoughtseize 3 Abrupt Decay 1 Ultimate Price 2 Devour Flesh 2 Far 3 Hero's Downfall 2 Dissolve 2 Bile Blight Sideboard Its hard to measure precisely how much better this deck would be with such a simple upgrade, but I imagine it would be substantial
Computer Search is undeniably powerful, but what makes it a well-designed card is that it sets a precedent for the entire history of the Pokmon TCG
Mogis's Warhound Mogis's Warhound grants +2/+2 for three mana but effectively goads the enchanted creature into attacking each turn