It can keep one of your creatures safe in the meantime, both because of its effect and because some opponents may be hesitant to let you transform it
the former keeps resources flowing throughout the game, while the second digs deep into your deck for an answer or to set up a win
Mechanics-wise, Alliances would follow the theme of 'smaller' blocks expanding upon the major mechanics introduced in its bigger block, so we've got a bunch of tie-ins to Ice Age like snow lands and more cumulative upkeep
Keep in mind, however, that foils and different print runs can make this method a less reliable
It's an excellent mana fixer, and provides a curiosity effect (with trample on top) to your big guys, potentially letting you draw a card with each attack
OTHER CARD ART ORIGINALS I do not have a complete list of all my original card art at this time