Asya, Ghitu Flamedancer

At the beginning of your upkeep, reveal the
top card of your library. If it's a Burn spell,
put it into your hand. (A Burn spell is an instant or sorcery spell that damages a target.)
At the beginning of your end step, if Burn spells you control dealt 6 or more damage
this turn, Asya deals 3 damage to any target.