Adriana provides a respectable buff but, again, Neyali provides a buff and card draw while costing less mana
Oh, and we have loxodon on Tarkir as well, another thing I didnt know
They're very often aggressively priced (a 0/3 for 1 mana can Block a lot of early Attackers and survive) They often have powerful abilities (consider something like Wall of Reverence, which is a 1/6 Flying Defender Creature for which gains you life equal to the Power of target Creature you control
Weve drafted, built decks, and played a bunch of Hour of Devastation matchesread on for our review
Your sideboard cards should be wrenches you throw into your opponents plan, not a plan in and of themselves
3: Each opponent sacrifices a creature with the greatest power among creatures that player controls