My mind control is working
The parity will take over life
hahahahahahahahahahahahahahahaha
... *Cough*
Anyway, seriously, straight up "both players heal" cards are kinda boring and very difficult to balance.
The trick with cards that help both players is to use things that both players can benefit from, and usually in small amounts.
Healing doesn't benefit both players - why would a rush care too much about healing? If the point of your deck is to deckout, you've just gotten two heals for the cost of 1, just about. No drawback for you, because you're decking out.