As with any other archetype, players are going to gravitate towards the most powerful version of a deck, so something akin to Edgar was bound to exist eventually
There are only a couple of cards purely for life gain that are viable and they are all reuseable effects, most come bolted onto an already good card to make it even better value
A lesser known banned art card is the Smoking Charmander from the CoroCoro Comic in 1997 featuring Pokemon playing cards that you would have to cut out
The decks other primary mechanics are +1/+1 counters and proliferate
But yeah, Doctor #4 has a once-per-turn effect that lets you play historic cards (that's to say, legendary cards, artifacts, and sagas) from the top
For that reason, shell find plenty of homes