Nomad Mythmaker's ability can target an Aura card in any graveyard, not just yours.
04-10-2004
wotc
You don't choose which creature the Aura will enter attached to until the ability resolves. You must choose a creature the Aura can legally enchant. (For example, you can't choose a creature with protection from black if the targeted Aura card is black.) If you don't control any creatures that the Aura can enchant, it remains in the graveyard.
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.