Deck Builder Building decks is as straightforward as collection management
Fake Flag: Replicas almost always miss this copyright detail entirely
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
Yeah, in Bruenor those treasures are +4/+0
To pay the emerge cost for a creature (which was always a discount, but included colored mana where the normal cost did not), you sacrifice a creature and pay an amount of mana equal to the emerge cost minus generic mana equal to the sacrificed creatures total mana value
Celesteela's Ultra Thrusters ability really gives the AI fits, since they will happily use it to switch in an Ultra Beast