Thot, God of Letters

Hexproof, Indestructible, Unblockable.
Wherever you cast an island, swamp, blue or
black spell, target player puts the top 3 cards
of his libary into his graveyard.
Thot, God of Letters cannot attack unless any opponent has 10 cards or more in his graveyard.
When Thot, God of Letters attacks, target player
puts the top 10 cards of his/her library into his graveyard.