This card is super strong in my opinion. With a low mana curve deck, you will likely already have cards in your hand for the first few turns. If not, you can just hold off. As soon as you reach the tipping point, you embiggen to get crazy value. I mean the squirrel guy will be a 2 mana 4 3, still not to bad.
I would go as far as to call it meta defining. Obvioudly the conparison to surrender to madness is ridicolous.
I think this is better than surrender to madness, not much, but better. Madness costs you tempo on everything, while this just costs you tempo on minions. A spell heavy token generator deck could use this to buff the few minions it runs without losing too much ground.
I think that people are really overerestimating this card: It's really bad, the only good thing about this is actually the 0 mana cost. But beside of this, you increase the mana cost of minions in your deck: having 5 or 6 mana on a minion is a HUGE difference. 5 mana allows you to be more lenient of the effects, 6 mana requires far more effects on board. You can't have a 2 mana minion costing 3 mana without having a huge effect on board. Especially on low minions like 1 mana ones. having +2/+2 on it is a huge buff, but having the mana cost doubled is also a huge deal.
And it only effects minions in your deck. Barnabas was a bad quest, Price Keleseth was only so strong because it has absolutely NO downside beside not having a 2 mana minion in your deck.
And Card draw as druid is so a thing: it's non-existant until you have enough mana. And when you have enough mana, you probably won't need the buff on them.
Might i be wrong: yes, but increasing the mana cost on minions is a huge deal.
This is 10 times better than surrender to madness. There is no comparison. As others have mentioned this always ultra cheap decks to ramp minions it also gives boosts to a mid-range deck that uses a lot of early game spell support. Not sure if it's good or not but there is a lot more opportunity with this card and the surrender comparison is an extremely bad one.