It still has ramp, card draw and +1/+1 counters on tap, so don't be afraid to sub out options that you have on hand and you'll consistently have powerful attackers beyond your Dragonclaw leader
These ones are my personal favorite because it is totally random, and entertaining as hell to open
Kaito, Cunning Infiltrator $15.46 Kaito, Cunning Infiltrator is tailor-made for ninja decks, and decks that care about saboteur effects in general
Here are a few: Atarka, World Render might have more of a win-more ability, but double strike on your dragons is a legit wincon
I really love the horrific flavor of some horrible Eldrazi beast erupting from inside another creature
Securing a land drop and giving you an extra card to play later is exactly what blue-red tempo decks need to keep up the pressure and not die down after some turns