This custom card is a summoning overload version of Dirty Rat, a card notorious for equalling screwing and adding the player that plays it. With The Candleking, whenever a minion is played, summon all minions with the same name from each player's hand.
This is a fun card in theory and probably would work in practice as well. Players will be encouraged to place two of any minion into their decks and not benefit decks such as Quest Rogue that need to play cards and not summon them.
If this card kind of works like Quest Rogue, then cards with the same foundation name count as the same card. For example, Imps, regardless of where they spawned from have the same tag.
A card like this could support a new way to play around without taking sides because it could easily come back take a card both players did not mean for it too.