what is the exact ruing when mutiple burning card are on the field, which one goes first? If for example i have both 'burning land' and 'Mask of the Accursed' of the field and both players have 500 HP at the beginning of my turn, which player will win?
The turn player has priority to activate his own effects so he will activate the effect of Mask of the Accursed before the opponent can activate the effect of Burning Land.
But your example doesn't make sense as you put it, it would need to be "What if my opponent has Burning Land and I have Mask of the Accursed in my turn?"
Lol was facing this guy with this card he burn himself to death pretty hilarious.