I would give this card a 8.
It is a great break ride unit. It only makes you retire two rear-guards in order to get your vanguard a 10k power boost, also you are allowed to draw two cards which make up for the units you have to retire.
This makes a great combo with Destruction Dragon, Dark Rex. I mean: you can break ride during your BATTLE PHASE. How awesome is that. The only thing you need to take into account for is that you have a full field when you use this way of break-riding. But if you attack with your rear-guards first u can get an extra guarding hand.
This card itself isn't so hard to guard against. The problem is when your opponent uses break ride. It will eat up your entire hand, especially when your opponent uses the Dark Rex combo.