Caeli'fiarÄ

( Caeli'fiarÄ isn't a spell, it's affected by summoning sickness, and it has " {t}: add {w} to your Mana
pool" )
{t}: Target creature gains Double Strike for as long as Caeli'fiarÄ remains tapped
You may choose not to untap Caeli'fiarÄ during your untap step