The casting cost, the flavor text, the mechanics they all riff off of Nivs endless Curiosity (which to be clear synergizes incredibly with the first two versions of Niv, and is a straight up combo with Niv-Mizzet, Parun)
Cards like T.A.P.P.E.R., Ticking Mime Bomb, and Juggletron ask you to mime, yell in robot voices, or analyze the art for hidden objects
But what is really important to us is the face to face interaction that we see in players and this is something that we hope does not change. Pokmon will soon be taking on the likes of Blizzards Hearthstone a game that Im hopelessly devoted towith the introduction of a new online version of the PTCG
Copying any creature you play for (presumably) a fraction of its mana cost, like a Simic deck might with Mystic Reflection, builds a terrifying army, especially if you copy creatures like Avenger of Zendikar and Eternal Witness with impactful ETBs
War Room War Rooms activated ability is a bit too costly (and painful!) for frequent use, but the option of sinking some extra mana into a card draw effect at instant speed is never a bad idea