Keros, the Mage Purger

Hexproof from monocolored.
When Keros deals combat damage to a player,
you may pay {1}{u}{b}, if you do that player reveals
their hand. Chose an instant or sorcery card in
their hand and exile it. As long as you control
Keros, you may cast that card without paying its
mana cost. If you cast it this way, put it into exile instead of anywhere else.
"The wizards coward behind their magic. They will
have nowhere to run once I use it against them"