1 for card draw in the late game
4 of these will surely be useful thoughout the game, particularly with Mirrorwing Dragon in play.
4 of these will sometimes help me get to 4 mana on turn 3 without being swiftly removed, and stick around to finish up with Ridgescale Tusker, Slip Through Space and so on.
1 of these to marginally increase the value of Champion of Rhonas, Wildfire Eternal, and the fatty brigade when hard-cast.
1 of to tilt combat in my favor