Tyler, The Truth Hammer

Can't be countered, Undying, Haste, Vigilance, Hexproof
{t}: All opponents discard there hands, and draw 1 card.
{b/g}{w/b}{t}: All players put the top 20 cards of his or her library into his or her graveyard.
{w/u}{u/b}{g/u}: No player can cast or put into play any spells.