This is The Voraxx HS Card from the Journey to Un’Goro expansion due for release in April.
It’s a Neutral minion and the card reads: After you cast a spell on this minion, summon a 1/1 Plant and cast another copy on it.
You can get The Voraxx by opening packs from the Journey to Un’Goro set.
*Has a home in Priest builds.