Conxaar Bringer of the Plague

Plague (This creature can only block creatures that are plagued. Whenever this creature deals damage to another creature that creature becomes plagued)
{t} Pay 10 life: Search your library for a card and put that card in your hand. Until end of turn you may cast that card without paying it's mana cost
Whenever you cast an instant or sorcery spell if you paid it's mana cost shuffle it into it's owners library instead of putting it in your graveyard