Skilled Black Magician

Ward {p/b}
Whenever a player casts an instant or sorcery,
put a Spell counter on this creature.
{b}{b}{b}; Remove three Spell counters and
sacrifice this creature: Put a 6 mana or less
Spellcaster creature from your hand, graveyard,
or library onto your battlefield.(Activate only as
a sorcery and if you choose library, shuffle after.)