Ariel, Number 13

As long as "Ariel, Number 13" is on the battlefield, your maximum hand size is 13.
• At the beginning of your upkeep step, draw cards until your hand size equals a number in the fibonacci sequence.
• At the end of your end step, discard cards until the number of cards in your hand is prime.
• If at the end of your turn your hand size is 13, send all cards in your hand to the graveyard.
{3}{w}{u}{g},{t}: Turn this card back over to "Ariel, the Timesinger".