(And as Aaron described in his column two weeks ago, Legendary Rules Changes, R&D also realized it was a perfect time to revamp the legend mechanic.) Once legends, or should I say legendary creatures, became part of the block's theme, all the designers started thinking about how to add some new wrinkles to the age old mechanic
Feed this vampire and youre sure to have a good time
So, I went about building decks around weird themes and mechanics
Yes, the white cards that draw you cards when your opponent casts spells cover the full range of only use in special cases to format staple. The best such card is Esper Sentinel, which requires opponents to pay mana to cast noncreature spells or you'll draw you a card
Among main decks of Izzet Prowess builds specifically, 6 players are running four copies, 75 are running three copies, 32 are running two copies, 8 are running one copy, and 19 are running no copies of Vivi Ornitier