For anyone still playing dragons, even tough whelp smuggler was mostly fixed you can still use Blood Gems to get reliable health boost.
It was nothing special until I noticed that Necrolyte considers every transfered gem as separate buff so after getting a couple of gems out of new 3 star boar I could quickly buff all of my dragons to 80+ health.
I was initially going for mech deathrattle stuff but just couldn't find this tier 6 mech at all. Then when some beasty player died and frogs became possible again I ended up getting 2 non-golden ones just on time for a big swing. First time ever I managed to get 2 golden parrots and a golden rivendare.
I just got 1st place with this build. Reno hero powered the Tier 5 minion that grows when a friendly Ele gains stats (cant remember the name). Had to try it out seeing it's now Tier 5 and never played it when it was T6. Damn it was fun lol. It wouldn't be a viable build normally though, need Reno to make it golden early.
True, animations took forever and opponents were emoting me like no tomorrow.
I pick tree whenever possible because his hero power is one of few that actually changes the flow of combat instead of providing economy/stat boost.
Maybe Deathwing is another one but ultimately +2 attack stops being that relevant lategame so I find that it's best just to go wide with him and hope your tokens get to clean up everything while spamming tier ups.