Flash, first strike, reach, hexproof

At the beginning of your end step, choose up to one spell that was cast this turn and copy that spell. You may cast the copy without paying its mana cost. Then after you have passed priority, if there are five or more abilities and/or spells on the stack, you may pay {2}{R}{G}{W}{U}. If you do, transform Ink-Treader, Praetors' Missionary.

Spells you cast gain storm.