Duna and Huki, Savior Duo

Flash, double strike, hexproof
When Duna and Huki, Savior Duo enters the battlefield, creatures you control have +1/+0 until end of turn.
Whenever Duna and Huki, Savior Duo attacks, you may cast target instant or sorcery in your graveyard with converted mana cost 3 or less without paying its mana cost.