Security : None to speak of, and loose cards can be endangered when you close it
You can make every discard a card, lose one life and draw a card, and sacrifice a Creature
Heres the perfect kill: Protection from Everything (Cant be blocked) Double Strike (When you are unblocked, and you will be, deal damage twice!) Frenzy 2 (When you are attacked and unblocked, and you will be, get +2/+0) Infect And you could choose Triple Strike from Three-Headed Goblin instead of double if your group allows a lot of silver-bordered options
Taking extra turns has always been a cool mechanic in Magic, however, its not nearly as fun for the person on the other side of the table
Meanwhile, Dragons brings up the rear thanks to a ton of flashy but inexpensive Dragon reprints