Aya, Tempting Evocate

Can't be countered, protection from spells.
When Aya enters play each player shuffles their graveyard into their library then exiles the top
half of their library face-down (round down).
If a player draws a card they draw the bottom
card of their library, and if a card goes to the
graveyard it goes on top of that player's library.
You have Ward {4}.