The box holds ten basic 'Jumpstart' style packs, two for each color, which newbies can slam together to form a complete 40 card deck
So, having another kind of card to help you do thatanother card one's opponents must challenge to removemeans changing strategy
The value of X is calculated only once, as Ouroboroid's ability resolves
Preacher Now, Preacher on the other hand has a few good reasons to be expensive: First of all, look at that amazing artwork by Quinton Hover
Theres also The Nipton Lottery, which is a pretty unreliable but very silly boardwipe and creature-stealing spell that seems like a blast to cast
If the second ability triggers multiple times in the same turn, perhaps because there were multiple combats, you will be able to play that many additional lands