If everything lived, which is likely considering the 3 hp on the mana wyrm and the double taunts, that's 9 random damage, 2 from the mana wyrms first attack, 3 from the apptentice and 5 from the mana wyrms second attack.
If he drew a good 5+ drop from the portal the game is likely over here - worst Ive seen are boom, iron juggernaut, the mistcaller, prophet velen.... If not he can enjoy 1 mana flame cannons to clear the board with. Eventually if you do even catch up fireballs and frostbolts are there to pick you off.
You realize that's like 6 specific cards in the first 3 turns right? And they have to be going second? That is not actually a common start. Not like Paladin which is just Knife Juggler/Minibot -> Muster for Battle -> Piloted Shredder (or Blessing of Kings) and you literally can't come back because Paladins also have an insane late game. Tempo Mage has a terrible late game (other than Antonidas). If you get them down to no cards in hand they basically can't recover. Unlike Paladin which just goes "herp derp Divine Favor I have 5 cards in hand again"
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Its fangs are in your flesh before its hiss leaves your ears.