With the release of top notch delve cards from Tarkir, the delirium mechanic things, flashback stuff, recursive dorks, and even just an increase in good graveyard recursion effects there is a significant increase to the value of self mill
A Flash counter and or blocker, there's some very fun way to use this, especially during things where your opponent may assume they're safe to be greedy, such as on a turn-ending before untapping fully, and I agree with Loxi: players like to tap out a lot carelessly
Its a deterrent for your opponents to chump-block and it gives you an additional benefit even if your creature dies in combat
As Pramikon is a wall itself, it naturally synergizes with various wall-tribal cards and toughness-based synergies whilst providing access to three colors worth of high-toughness creatures
As the blue member of the cycle, it offers a free counterspell that delays creatures or planeswalkers without ever spending mana