How to level monster cards fast, can it only be done with other monster cards or can you also use gems?
Also for necro what would be the best card solution.
Only cards.
1.Spam dungeon lvl 190
2.Make alt
Got mine to 10 using tons of Necroventer cards my 3 Alts had from running lvl90 dungeon so many times. (My alts always got card drops while my Sorc never did) ;s I’m pretty sure devil cards can lvl up mutant ones if that’s what Necro uses.
ah dam it, i just used all the cards on my alts on my gems 
can you equip cards already?
not yet
20 characters
Transfer it to a trusted friend to use their junk cards on it. Transfer it back when they are done. Easy lvl 10 card.
Process:
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thanks for this, i just did that. he had 20 cards unused it’s now almost level 9.
Glad I could help! I believe they plan to implement an easier way to trade boss cards later on. 