As long as you control a Dragon, Dragonloft Idol gets +1/+1 and has flying and trample.
The idols were forged during the time of the Khanfall, when the dragons came to rule Tarkir and its people aligned themselves with the five dragonlords.
Because damage remains marked on a creature until it's removed as the turn ends, damage dealt to Dragonloft Idol may become lethal if you no longer control a Dragon later in the turn.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.