Spell Queller 1 W U
Creature - Spirit
When Spell Queller enters the battlefield, exile target spell with converted mana cost 4 or less.
When Spell Queller leaves the battlefield, the exiled card's owner may cast that card without paying its mana cost.
Really interesting creature (I believe that any flash creature has some merit). Most of the time it's an overpriced limited counterspell, but it can sometimes protect our own spells from fow or flusterstorm. When Queller leaves play the opponent can cast the spell, but maybe then it's too late for them.
Spellstutter sprite has a similar effect, and thought it saw play some years ago, now it sees 0 play in vintage or legacy. However sprite effectively counters cc0 and cc1, while this card can ~~counter ~~exile cc2 and cc3. The cost is higher too.
This it's only a 2/3, so it's not something terribly aggro, but every 2 damage counts (trinket mage has won too many matches). In a creature deck this can effectively be a time walk, while adding more damage next turn.