You can potentially ultimate before you untap with very little effort
Linvala, Keeper of Silence (Rise of the Eldrazi, 2010) You might notice that this card is reminiscent of an earlier card on this list in that it disables activated abilities on creatures
Robin Hood - Sharpshooter depicts him leaping up into the air to aim his bow, and the Enchanted version tilts his angle upward in a more triumphant pose
It will tap for one color of each mana, and thus can really help in different places with mana smoothing
It sees enough play to end up over $10
Tidus, Zanarkand Fayth (Thrasios, Triton Hero) You'd be hard-pressed to see Thrasios played anywhere other than low-powered Merfolk Commander decks, but the Final Fantasy X cover art is the big selling point here