Like most Magic: The Gathering cards, the value of Blue Dragon depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Adventures in the Forgotten Realms)
You'll often find a way to make black mana by the time you're ready to cast your Garruk, and even if you don't, having one card stuck in your hand for a little while isn't a complete catastrophe
9. It will come with one of the five promo cards shown below, and the pack can be claimed from the Gifts menu on the home screen
The booster sets rarity breaks down as 10 Ultra Rare Cards, 15 Super Rare Cards and 35 Rare Cards
This is because if a creature under your control would die, Hofri exiles that creature, then creating a token copy of that creature that's a Spirit