Gaea's Blessing and Ashiok
Gaea's Blessing isn't working with Ashiok properly. Ashiok mills the top 4 cards. End of sentence and single effect of milling 4 cards. It then says to exile all milled cards for a second effect (separate from the first NOT combined). The two effects are separated for a reason. If a card is just exiled from the top of the deck... then Gaea's Blessing reshuffle effect won't go off cause it never hit the grave yard. But Ashiok mills first and should trigger the reshuffle effect when a Gaea's Blessing is hit. The Gaea's Blessing effect should resolve right after the mill 4 cards. The difference is the end of sentence separation. If Ashiok said mill 4 cards AND exile all cards milled... the Gaea's Blessing won't go off. Specific grammar and syntax for separation. Gaea's Blessing SHOULD shuffle when hit with a 4 card mill from Ashiok.
Grammar notwithstanding, Ashiok's ability will resolve completely before Gaea's Blessing's triggered ability goes on the stack. When it does go on the stack, it has already been exiled and won't do anything.