The strength of the card comes from the elusive ability trample, that already proved its power
You can find Eric Switzer's reveal on Twitter
The full effects of the spell can be seen in the foreground, as its unfortunate victims dissolve into ash
I'm not sure if it was restricted out of fairness, or if they actually thought the card was overpowered at 2 mana (can't imagine the thought process, when crusade and bad moon were fine, but then, they restricted gauntlet of might, so maybe they didn't like red guys getting pumped!) Rukh egg looks fine today, maybe even pretty weak
On the characters second turn on the board, they can take any action available to them
Migration Path There's basically no reason to play Explosive Vegetation anymore with so many strictly better versions out there