Sagacious Trickster

Flying, spellbind (Whenever you cast an instant or sorcery spell with converted mana cost 4 or less, if it
shares a color with this creature, you may exile it with
a bind counter instead of sending it to the graveyard
as it resolves.)
Whenever Sagacious Trickster attacks, you may
cast an instant or sorcery spell in exile with a
bind counter on it that shares a color with this creature without paying its mana cost.