In the context of the card, it appears to be wordplay on the fact that the word "present" can refer to a gift you give to someone (in which case, it's pronounced like "pleasant") or the act of showing something off (in which case, it's pronounced like "prevent"), and the effect appears to be using both meanings at the same time
Mana Vault Mana Vault nets you 2 mana when you cast it, which can lead to some pretty explosive turns
Since rares (until they tell us different) come along at twice the rate of mythics, you have a 1/38 chance of a particular EA rare and a 1/76 chance of a particular mythic EA
These boxes don't affect gameplay, but help identify your deck's prominent Type when browsing
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You dont have this luxury for Magic buy lists