Or we can just kill them. Kill Spells are tactical in MtG; there's always too many creatures to kill them all. Not here. Here you are guaranteed not only to have enough kill spells, but automatic card advantage as well. Kill any reinforced creature and you have already won the card advantage game.

Mastery is also our enemy. Bronze now features many opponents who know this, and tailored their decks to stay in Bronze and kill the noobs. Be equal to them, lose to them, doesn't matter; it's still better than facing the much greater number of excellent players who not only tailor their decks, but have access to cards you may never own.