Thanks to powerhouse cards such as Sheoldred, the Apocalypse and Fable of the Mirror-Breaker Rakdos has been utterly devastating, even outside of Standard
The rate on this thing is great: assuming youre in a four-player pod and your opponents have plenty of things to sacrifice, you get an 11/11 flying trampler (flampler) for five mana, a 19/19 flampler for seven mana, a 27/27 for nine, and so on (on second thought, maybe this shouldnt have haste)
Runaway Steam-Kin is great on turn-two and works great with Experimental Frenzy, but its very weak to removal and can be a bad draw later in the game
Her ability to tap any untapped wizard you control to draw a card transforms a field of random Wizards into an incredible card advantage engine that isn't even affected by summoning sickness
In the case of Keruga, the companion requirement is that your starting deck contains only cards with a mana value of three or greater and lands
Baleful Strix I really, really like Baleful Strix