bloomburrow mtg collector booster box – Mox Boarding House and the elemental calamity beasts and the Great MTG - Bloomburrow - Booster

I was so concerned with Kain's control effect being downside or needing to hurt the opponent that I hadn't even considered the card could instead switch sides but give you an upside when you gave him away

From my initial predictions, I was also able to predict Sephiroth having something like a wrath mechanic , which Sephiroth, Planet's Heir kind of does by debuffing all your opponents' creatures, potentially wiping out large swaths of weak token creatures

It also adds some much-needed speed

You could build it up as a Voltron commander and make use of this to commander damage your way to victory, or fill it up with other ways to dish out damage like Roiling Vortex and Guttersnipe