Mid-game card, not late game. Mid game, and i think its rather fine. And you do want three, because you must think about this mathematically. You don't need to draw it in the early game, but you do need it in the mid-game. And three cards is the ideal number for drawing at least one by the mid-game.
The reason I say one is that while 1 may be nice, any more that are drawn will almost always be dead cards.
Take the Steam Engine/Chimera strategy. You start your early game placing down one steam machine, making use of ice shield for a defense. Build it up until you can afford the chimera, as soon as you can, use the chimera keeping their high attack power. Play another engine, gravity pull it. If possible play a third and build it up.
The high HP of the steam machines make them ideal.
What does Chimera do for the steam machine that momentum doesn't? Playing Chimera on it makes the creature you've spent a decent amount of time building up vulnerable to every creature the opponent has, lobotomizes it, and costs way more.
Without the gravity pull, it would be quite overpowered. If you feel it is up, give it a ten hp boost.
It might be too strong without gravity pull, but my suggestion is to make it immortal. Right now there's just too many cards that trade a ton of cards for one with chimera.
Or to reference what you said in the discord thread, Chimera has too many hard counters. Reverse time is a completely hard counter, and antimatter, mutation, freeze and basilisk blood are pretty close.