I would put Fireblast in that spot--it's a good quick finisher and you can play it after tapping out.

I don't really see why people put Vendilion Clique in with tempo... it's not realistically a tempo card.

You can't drop it until turn 3, it doesn't actually reduce your opponent's hand-size and it's effectiveness is not a guarantee (although it usually is). By turn 3, I'd rather be snapping in stifles, Delver is a better beater. In my opinion if your deck is working correctly then what they have in their hand shouldn't matter much: they shouldn't have the mana to cast it before they die. Obviously shit doesn't happen optimally, but I would rather have 2 burns in that spot.

Keldon Marauder's aren't a terrible choice either: bare minimum they do 2 damage to the opponent, but can do 5 damage for 2 mana on the higher end (which is entirely possible).

They can be removal or life-gain depending on what you need, chump that Tarmogoyf or force them to block it.