Ashariel, Ancient Ruler

Flying, Vigilance
Ward—Discard a card
Whenever a creature attacks, if it's a land, it gains "When this creature dies this turn,
untap target land and you lose 3 life."
{x}{w/u}{g/w}{g/u},{t}: Untap up to x lands,
they become X/X Dragon creatures with flying until end of turn. They're still lands.