Ali Baba and The Forty Thieves

Band of Thieves (If Ali Baba is your commander, you must choose three other Rogue creature cards. Ali Baba's color(s) and color identity are all the colors of the chosen cards. As the game begins, reveal those cards and shuffle them alongisde Ali Baba into a deck. Place it into your Command Zone face-down. You may look at the top card of your Thieves deck any time and you may cast it. Spells you cast this way cost {1} more to cast for each card in your Thieves deck.)
Vigilance
{1}{t}: Copy target activ