Elvara, Steed of Arjuna

Eminence - As long as Elvara, Steed of Arjuna is in the command zone or on the battlefield, at the beginning of your upkeep, you get a construct counter.
Flying, First Strike, Vigilance, Haste
{t}: You may cast a card from your hand with converted mana cost equal to or less than the number of construct counters you have without paying its mana cost.