I refer to the behold mechanic as a point to a dragon, or promise us you put a bunch of dragons in your deck. Present on a lot of the cards in the set (naturally, given the prevalence of dragons on Tarkir), to behold a dragon allows a player to either point to a dragon card they have in either their hand or played on the battlefield, and use its presence to activate an ability on another card
The sets also introduced new mechanics, such as Pokmon-ex cards
It lets you store 2 mana until it's useful, making it a powerful ritual that enables explosive starts
This cards triggered ability is also very powerful
I once ran Everlasting Torment against Brago, and Lightning Bolted his leader when he attacked me, dropping it to a 0/1 permanently
Getting the most out of your cards Now that you've got thoughts on how to prioritize the drafting portion, let's talk about getting it done on the battlefield itself