This is a perfect example of an overpowered card the game doesn't need.
Why you think so? 4 mana 3/5 with strong but very conditional effect is not that powerful. It's useless against 80% of decks.
80% of the powerful decks in both standard and wild use some form of mana cheat or cheat out minions from their deck, this effectively absolutely destroy all those decks, this card would be an easy auto-include on every single deck, 4 mana 3/5 is ok enough to the point of being an ok tempo play on curve, so you have a card that obliterates every current top tier deck while also being ok as tempo on the match-ups where the effect isn't needed. Not to say also that this card would also kill stuff like minions from Free From Amber or Animal Companion as the minions themselves do not come from your hand, also stuff from sticky minions like Devilsaur Egg while also rendering cards like Giggling Inventor completely useless, this is not a tech card, it's an auto-include that would be way too powerful, the absolute opposite of a tech.
80% of the powerful decks in both standard and wild use some form of mana cheat or cheat out minions from their deck, this effectively absolutely destroy all those decks, this card would be an easy auto-include on every single deck, 4 mana 3/5 is ok enough to the point of being an ok tempo play on curve, so you have a card that obliterates every current top tier deck while also being ok as tempo on the match-ups where the effect isn't needed. Not to say also that this card would also kill stuff like minions from Free From Amber or Animal Companion as the minions themselves do not come from your hand, also stuff from sticky minions like Devilsaur Egg while also rendering cards like Giggling Inventor completely useless, this is not a tech card, it's an auto-include that would be way too powerful, the absolute opposite of a tech.