It makes Beast Within cost SIX mana
Gev isn't the only card that does burn damage
If you accept that you are basically never going to hit the sweet spot of needing some scry and needing some burn than you always just have a bad Shock or an awful Preordain
8 General's Enforcer General's Enforcer is a fantastic Human as you will give your commander, as well as any other legendary Humans you control, indestructible
The more lenient you are with issuing proxies, the more you will have to end up issuing during a tournament and the more lax your players will get when it comes to ensuring their decks
Destined on the stack is still a black instant with a converted mana cost of 2, and Lead on the stack is still a green sorcery with a converted mana cost of 4, but Destined to Lead, any time it's not one or the other, is a black and green instant sorcery with a converted mana cost of 6