Still possible? Of course, its easier than its ever been to transition to 4*s...
CP is given out many different ways, DDQ is more profitable than it used to be, an additional node was added for more rewards to pve without the progression bar moving... you can target specific heroes with the favorite option...
By just playing you'll accidentally transition from 3*s to 4*s now...
If you're asking on ways to make that more efficient, theres probably a lot of advice folks can give to bootstrap your progress... Without knowing where you are in the 3* game I'd have this bit of general advice:
Characters to favorite (only favorite one at a time per tier to focus progress):
3* strange - his yellow will be a workhorse in the 3* game, and basically puts transitioning into 3* land on autopilot, fantastic way to deal with goons
3* thanos - his black will get you through all seed teams and the trivial nodes, pair him with high match damage and/or quick damage
3* im40 - one of the best characters to facilitate the 4* transition, can be a battery for quite a lot of highly damaging 4*s
4* r&g - their "welcome to the team" skill can define all your matches in pve scl7 and below, pair him with any other GOTG character for a very easy transition
PvE:
I highly recommend not going past scl7 if you are just transitioning into 4*s, even playing to half progression gets you the required 4* cover, and at scl7 3* thanos can take care of your 3 trivial nodes (pair him with any single covered 5* for match damage) 3* strange can take care of goon heavy nodes. If you get 4* r&g championed then pairing him with a GOTG partner will take care of any node, including the essentials regardless of their third (if you draw him, pair r&g with 5*SL and thanos if you need to go FAST)
DDQ should be trivial to complete, if youre missing a 4* its not that big a deal, you'll have it rostered next time around, still a great source for cp and iso.
PVP:
Use thanos and any 5*s you have to clear lightning round seed teams (with thanos black start with the level 1-13 non-featured character.
Target 575 for the CP in PvP, use the skip option liberally and don't waste too much HP on shields (if you're not at or above 150 roster spots, I'd suggest dumping HP exclusively into roster spots).
If you're going to spend real money, I personally find the $2 cheapest HP bundle to be the best value, buy it at the first of the month and you have access to all the extra (used-to-be-intercept) node rewards. VIP seems like a ripoff, and anything else seems even worse.
JackTenrec said: Play the long game. Roster/champion/sell 2* characters, whose rewards will feed you tokens, CP and 3* covers. Roster and champion (and maybe some day be lucky enough to sell) all 3* characters, whose rewards will feed you tokens, CP and the rare 4* cover. I'm too impatient to bother with hoarding; sure, it might increase your odds incrementally, but you're paying the opportunity cost of not improving your current roster. I think you can get away with slightly fewer roster slots than MissChinch suggests -- I roll somewhere in the mid 130s, and have everyone except for the 1* characters rostered (even Howard/DD/Yelena/Bagman), but I'm also nowhere near 3* farming level.
MissChinch said: If you're going to spend real money, I personally find the $2 cheapest HP bundle to be the best value, buy it at the first of the month and you have access to all the extra (used-to-be-intercept) node rewards. VIP seems like a ripoff, and anything else seems even worse.