The healing they give is really cool, but it's a 3-card combo and extremely vulnerable to any CC. Adrenavamps, btw, heal 12 with a 2-card combo, something "equivalent" and it's not OP at all.
Another way yo heal yourself a lot is with black dragon + liquid shadow + parallel universe or just golden dragon + liquid shadow.
1) There are several ways to heal yourself other than with Heal and Bonds. Think in the field as a battlefield, not as a 100 damage race. CC is always useful.
2) Use it yourself in PVP1 and claim it's OP after you claim you can abuse it (let's say 90% win rate)